How to show one div over another one?

I have this carousel and I can't get overlay to be under the hero text.

Here's the html/css:

/********************************/


/*       Fade Bs-carousel       */


/********************************/

.fade-carousel {
  position: relative;
  height: 850px;
}

.fade-carousel .carousel-inner .item {
  height: 1000px;
}

.fade-carousel .carousel-indicators>li {
  width: 15px;
  height: 15px;
  margin: 0 2px;
  background-color: rgba(0, 0, 0, 0);
  border-color: #fff;
  border-width: 3px;
}

.fade-carousel .carousel-indicators>li.active {
  background-color: #fff;
}


/********************************/


/*          Hero Headers        */


/********************************/

.hero {
  position: absolute;
  top: 50%;
  left: 50%;
  color: #fff;
  text-align: center;
  text-transform: uppercase;
  -webkit-transform: translate3d(-50%, -50%, 0);
  -moz-transform: translate3d(-50%, -50%, 0);
  -ms-transform: translate3d(-50%, -50%, 0);
  -o-transform: translate3d(-50%, -50%, 0);
  transform: translate3d(-50%, -50%, 0);
}

.hero h1 {
  font-size: 6em;
  font-weight: bold;
  margin: 0;
  padding: 0;
}

.fade-carousel .carousel-inner .item .hero {
  opacity: 0;
  -webkit-transition: 2s all ease-in-out .1s;
  -moz-transition: 2s all ease-in-out .1s;
  -ms-transition: 2s all ease-in-out .1s;
  -o-transition: 2s all ease-in-out .1s;
  transition: 2s all ease-in-out .1s;
}

.fade-carousel .carousel-inner .item.active .hero {
  opacity: 1;
  -webkit-transition: 2s all ease-in-out .1s;
  -moz-transition: 2s all ease-in-out .1s;
  -ms-transition: 2s all ease-in-out .1s;
  -o-transition: 2s all ease-in-out .1s;
  transition: 2s all ease-in-out .1s;
}


/********************************/


/*            Overlay           */


/********************************/

.overlay {
  position: absolute;
  width: 100%;
  z-index: 2;
  height: 1000px;
  background-image: url(../img/dotspattern.png);
  background-attachment: fixed;
}


/********************************/


/*          Custom Buttons      */


/********************************/

.btn.btn-lg {
  padding: 10px 40px;
}

.btn.btn-hero,
.btn.btn-hero:hover,
.btn.btn-hero:focus {
  color: #f5f5f5;
  background-color: #1abc9c;
  border-color: #1abc9c;
  outline: none;
  margin: 20px auto;
}


/********************************/


/*       Slides backgrounds     */


/********************************/

.fade-carousel .slides .slide-1,
.fade-carousel .slides .slide-2,
.fade-carousel .slides .slide-3 {
  height: 100vh;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

.fade-carousel .slides .slide-1 {
  background-image: url(https://ununsplash.imgix.net/photo-1416339134316-0e91dc9ded92?q=75&fm=jpg&s=883a422e10fc4149893984019f63c818);
}

.fade-carousel .slides .slide-2 {
  background-image: url(https://ununsplash.imgix.net/photo-1416339684178-3a239570f315?q=75&fm=jpg&s=c39d9a3bf66d6566b9608a9f1f3765af);
}

.fade-carousel .slides .slide-3 {
  background-image: url(https://ununsplash.imgix.net/photo-1416339276121-ba1dfa199912?q=75&fm=jpg&s=9bf9f2ef5be5cb5eee5255e7765cb327);
}


/********************************/


/*          Media Queries       */


/********************************/

@media screen and (min-width: 980px) {
  .hero {
    width: 980px;
  }
}

@media screen and (max-width: 640px) {
  .hero h1 {
    font-size: 4em;
  }
}

<div class="container-fluid custom-fluid">
  <!-- Overlay -->
  <div class="overlay"></div>

  <div class="carousel fade-carousel slide" data-ride="carousel" data-interval="6000" id="bs-carousel">
    <!-- Indicators -->
    <ol class="carousel-indicators">
      <li data-target="#bs-carousel" data-slide-to="0" class="active"></li>
      <li data-target="#bs-carousel" data-slide-to="1"></li>
      <li data-target="#bs-carousel" data-slide-to="2"></li>
    </ol>

    <!-- Wrapper for slides -->
    <div class="carousel-inner">
      <div class="item slides active">
        <div class="slide-1"></div>
        <div class="hero">
          <hgroup>
            <h1>We are creative</h1>
            <h3>Get start your next awesome project</h3>
          </hgroup>
          <button class="btn btn-hero btn-lg" role="button">See all features</button>
        </div>
      </div>
      <div class="item slides">
        <div class="slide-2"></div>
        <div class="hero">
          <hgroup>
            <h1>We are smart</h1>
            <h3>Get start your next awesome project</h3>
          </hgroup>
          <button class="btn btn-hero btn-lg" role="button">See all features</button>
        </div>
      </div>
      <div class="item slides">
        <div class="slide-3"></div>
        <div class="hero">
          <hgroup>
            <h1>We are amazing</h1>
            <h3>Get start your next awesome project</h3>
          </hgroup>
          <button class="btn btn-hero btn-lg" role="button">See all features</button>
        </div>
      </div>
    </div>
  </div>
</div>

I want my text in the slide to show over the overlay pattern, but can't get the code to do it. Thanks in advance!

Solution

Set .hero { z-index: 5} (or any number bigger than 2) for it to work.

/********************************/
/*       Fade Bs-carousel       */
/********************************/
.fade-carousel {
    position: relative;
    height: 850px;
}
.fade-carousel .carousel-inner .item {
    height: 1000px;
}
.fade-carousel .carousel-indicators > li {
    width: 15px;
    height: 15px;
    margin: 0 2px;
    background-color: rgba(0,0,0,0);
    border-color: #fff;
    border-width: 3px;
}
.fade-carousel .carousel-indicators > li.active {
  background-color: #fff;
}

/********************************/
/*          Hero Headers        */
/********************************/
.hero {
    position: absolute;
    top: 50%;
    left: 50%;
    color: #fff;
    z-index: 5;

    text-align: center;
    text-transform: uppercase;
    -webkit-transform: translate3d(-50%,-50%,0);
    -moz-transform: translate3d(-50%,-50%,0);
    -ms-transform: translate3d(-50%,-50%,0);
    -o-transform: translate3d(-50%,-50%,0);
    transform: translate3d(-50%,-50%,0);
}

.hero h1 {
    font-size: 6em;    
    font-weight: bold;
    margin: 0;
    padding: 0;
}

.fade-carousel .carousel-inner .item .hero {
    opacity: 0;
    -webkit-transition: 2s all ease-in-out .1s;
       -moz-transition: 2s all ease-in-out .1s; 
        -ms-transition: 2s all ease-in-out .1s; 
         -o-transition: 2s all ease-in-out .1s; 
            transition: 2s all ease-in-out .1s; 
}
.fade-carousel .carousel-inner .item.active .hero {
    opacity: 1;
    -webkit-transition: 2s all ease-in-out .1s;
       -moz-transition: 2s all ease-in-out .1s; 
        -ms-transition: 2s all ease-in-out .1s; 
         -o-transition: 2s all ease-in-out .1s; 
            transition: 2s all ease-in-out .1s;    
}

/********************************/
/*            Overlay           */
/********************************/
.overlay {
  position: absolute;
    width: 100%;
    z-index: 2;
    height: 1000px;
    background-image: url(../img/dotspattern.png);
    background-color: rgba(250, 0, 0, .1);
    background-attachment: fixed;
}

/********************************/
/*          Custom Buttons      */
/********************************/
.btn.btn-lg {padding: 10px 40px;}
.btn.btn-hero,
.btn.btn-hero:hover,
.btn.btn-hero:focus {
    color: #f5f5f5;
    background-color: #1abc9c;
    border-color: #1abc9c;
    outline: none;
    margin: 20px auto;
}

/********************************/
/*       Slides backgrounds     */
/********************************/
.fade-carousel .slides .slide-1, 
.fade-carousel .slides .slide-2,
.fade-carousel .slides .slide-3 {
  height: 100vh;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

.fade-carousel .slides .slide-1 {
  background-image: url(https://ununsplash.imgix.net/photo-1416339134316-0e91dc9ded92?q=75&fm=jpg&s=883a422e10fc4149893984019f63c818);
}
.fade-carousel .slides .slide-2 {
  background-image: url(https://ununsplash.imgix.net/photo-1416339684178-3a239570f315?q=75&fm=jpg&s=c39d9a3bf66d6566b9608a9f1f3765af);
}
.fade-carousel .slides .slide-3 {
  background-image: url(https://ununsplash.imgix.net/photo-1416339276121-ba1dfa199912?q=75&fm=jpg&s=9bf9f2ef5be5cb5eee5255e7765cb327);
}

/********************************/
/*          Media Queries       */
/********************************/
@media screen and (min-width: 980px){
    .hero { width: 980px; }    
}
@media screen and (max-width: 640px){
    .hero h1 { font-size: 4em; }    
}

<div class="container-fluid custom-fluid">
    <!-- Overlay -->
    <div class="overlay"></div>

    <div class="carousel fade-carousel slide" data-ride="carousel" data-interval="6000" id="bs-carousel">
        <!-- Indicators -->
        <ol class="carousel-indicators">
            <li data-target="#bs-carousel" data-slide-to="0" class="active"></li>
            <li data-target="#bs-carousel" data-slide-to="1"></li>
            <li data-target="#bs-carousel" data-slide-to="2"></li>
        </ol>

        <!-- Wrapper for slides -->
        <div class="carousel-inner">
            <div class="item slides active">
                <div class="slide-1"></div>
                <div class="hero">
                    <hgroup>
                        <h1>We are creative</h1>
                        <h3>Get start your next awesome project</h3>
                    </hgroup>
                    <button class="btn btn-hero btn-lg" role="button">See all features</button>
                </div>
            </div>
            <div class="item slides">
                <div class="slide-2"></div>
                <div class="hero">
                    <hgroup>
                        <h1>We are smart</h1>
                        <h3>Get start your next awesome project</h3>
                    </hgroup>
                    <button class="btn btn-hero btn-lg" role="button">See all features</button>
                </div>
            </div>
            <div class="item slides">   
                <div class="slide-3"></div>
                <div class="hero">
                    <hgroup>
                        <h1>We are amazing</h1>
                        <h3>Get start your next awesome project</h3>
                    </hgroup>
                    <button class="btn btn-hero btn-lg" role="button">See all features</button>
                </div>
            </div>
        </div>
    </div>
</div>