How to add button inside input field

Question

Trying to copy some front end mentor challenges I am right now styling input field. I want to do 3 things right now.

1. I want to display the button inside the input field (even though I made it inside it is not perfect fit)
2. display the error icon inside the input field.
3. display the message "please provide a valid Email" below the textbox.

Right now it displays like this

.left button {
  background-image: linear-gradient(135deg, hsl(0, 80%, 86%), hsl(0, 74%, 74%));
  border: none;
  border-radius: 50px;
  width: 100px;
  margin-left: -104px;
  margin-top: -30px;
  height: 48px;
}

.left input {
  background-color: transparent;
  border: 1px solid hsl(0, 36%, 70%);
  border-radius: 15px;
  padding: 13px;
  width: 60%;
}

.left .error {}

<form action="#">
  <input type="text" placeholder="Email Address">
  <img src="/images/icon-error.svg" alt="" class="error">
  <button type="submit"><img src="/images/icon-arrow.svg " ></button>
  <small>please provide a valid Email</small>
</form>

Answer 1

They have different border radius - the button and the input. How could they be perfect match? Also different height. As for the "hint" line, just place it under in it's own div. I've tweaked a little your example using float:left and some adjustments. It's not perfect implementation but looks ok. Note height + padding = 48px.

.my-input-group {
  position: relative;
}

.left input {
  background-color: transparent;
  border: 1px solid hsl(0, 36%, 70%);
  border-radius: 15px;
  padding: 13px;
  padding-right: 113px;
  width: 60%;
  height: 22px;
  float: left;

}

.left button {
  background-image: linear-gradient(135deg, hsl(0, 80%, 86%), hsl(0, 74%, 74%));
  border: 1px solid transparent;
  border-radius: 15px;
  width: 100px;
  height: 48px;
  float: left;
  position: relative;
  left: -101px;
  top: 1px;
}

.left .error {}

my-input-group

<form action="#" class="left">
  <div class="my-input-group">
    <input type="text" placeholder="Email Address">

    <button type="submit"><img src="/images/icon-arrow.svg "></button>
    <div style="clear:both"></div>
    <div class="error">
      <small>please provide a valid Email</small>
    </div>
  </div>
</form>

<img src="/images/icon-error.svg" alt="" class="error">