So I had the button working until i added a new block div called 'dark-blueright' and positioned it under 'light-blue'.
/*
▒█▀▀▀█ ▀▀█▀▀ ▒█░░▒█ ▒█░░░ ▒█▀▀▀ ▒█▀▀█ ▒█▀▀▀ ▒█▀▀▀█ ▒█▀▀▀ ▀▀█▀▀
░▀▀▀▄▄ ░▒█░░ ▒█▄▄▄█ ▒█░░░ ▒█▀▀▀ ▒█▄▄▀ ▒█▀▀▀ ░▀▀▀▄▄ ▒█▀▀▀ ░▒█░░
▒█▄▄▄█ ░▒█░░ ░░▒█░░ ▒█▄▄█ ▒█▄▄▄ ▒█░▒█ ▒█▄▄▄ ▒█▄▄▄█ ▒█▄▄▄ ░▒█░░
*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
body {
line-height: 1;
}
ol, ul {
list-style: none;
}
blockquote, q {
quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
content: '';
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
/*
▒█▀▀▀█ ▀▀█▀▀ ▒█░░▒█ ▒█░░░ ▒█▀▀▀ ▒█▀▀▀█ ▒█░▒█ ▒█▀▀▀ ▒█▀▀▀ ▀▀█▀▀
░▀▀▀▄▄ ░▒█░░ ▒█▄▄▄█ ▒█░░░ ▒█▀▀▀ ░▀▀▀▄▄ ▒█▀▀█ ▒█▀▀▀ ▒█▀▀▀ ░▒█░░
▒█▄▄▄█ ░▒█░░ ░░▒█░░ ▒█▄▄█ ▒█▄▄▄ ▒█▄▄▄█ ▒█░▒█ ▒█▄▄▄ ▒█▄▄▄ ░▒█░░
*/
@font-face {
font-family: headingf;
src: url(header-font.ttf);
}
@font-face {
font-family: mainf;
src: url(main-font.ttf);
}
@font-face {
font-family: iconf;
src: url(icon.ttf);
}
.background_colour {
background-color: #c6cdd1;
height: 1700px;
position: relative;
left: 0px;
top: 0px;
z-index: -2;
}
.iconsf {
font-family: iconf;
font-size: 40px;
text-indent: 40px;
float: left;
}
.light-blue {
width: 1000px;
height: 500px;
position: relative;
background-color: #68cef3;
}
.dark-blueright {
width: 1000px;
height: 1000px;
background-color: #00aae7;
position: absolute;
left: 0px;
top: 0px;
z-index: -1;
}
.header-text {
font-family: headingf;
font-size: 170px;
position: inherit;
text-align: center;
top: 80px;
color: #ffffff;
letter-spacing: 10px
}
.welcome-text {
font-family: mainf;
font-size: 70px;
position: inherit;
text-align: center;
top: 60px;
color: #ffffff;
letter-spacing: 10px
}
.button-style1 {
position: relative;
top: 220px;
left: 400px;
background:-webkit-gradient( linear, left top, left bottom, color-stop(0.05, #00a9e7), color-stop(1, #00a9e7) );
background:-moz-linear-gradient( center top, #00a9e7 5%, #00a9e7 100% );
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#00a9e7', endColorstr='#00a9e7');
background-color:#00a9e7;
-webkit-border-top-left-radius:0px;
-moz-border-radius-topleft:0px;
border-top-left-radius:0px;
-webkit-border-top-right-radius:0px;
-moz-border-radius-topright:0px;
border-top-right-radius:0px;
-webkit-border-bottom-right-radius:0px;
-moz-border-radius-bottomright:0px;
border-bottom-right-radius:0px;
-webkit-border-bottom-left-radius:0px;
-moz-border-radius-bottomleft:0px;
border-bottom-left-radius:0px;
text-indent:-20px;
border:1px solid #ffffff;
display:inline-block;
color:#ffffff;
font-family:mainf;
font-size:15px;
font-weight:bold;
font-style:normal;
height:80px;
line-height:80px;
width:200px;
text-decoration:none;
text-align:center;
}
.button-style1:hover {
opacity: 0.6;
}
.button-style1:active {
opacity: 1;
}<!DOCTYPE html>
<html>
<link rel="stylesheet" type="text/css" href="style.css">
<body>
<div class="background_colour">
<div class="dark-blueright">
</div>
<div class="light-blue">
<div class="header-text">
Oh. Hello
</div>
<div class="welcome-text">
welcome
</div>
<a href="#" class="button-style1"><span class="iconsf">r</span>Goto art</a>
</div>
</div>
</body>
</html>
I wanted the button to change opacity when hovered, which it did. But my positioning skills in css are awful and couldn't find help researching.
Your z-index on class .background_colour was wrong, I corrected that and the hover effect is working now.
/*
▒█▀▀▀█ ▀▀█▀▀ ▒█░░▒█ ▒█░░░ ▒█▀▀▀ ▒█▀▀█ ▒█▀▀▀ ▒█▀▀▀█ ▒█▀▀▀ ▀▀█▀▀
░▀▀▀▄▄ ░▒█░░ ▒█▄▄▄█ ▒█░░░ ▒█▀▀▀ ▒█▄▄▀ ▒█▀▀▀ ░▀▀▀▄▄ ▒█▀▀▀ ░▒█░░
▒█▄▄▄█ ░▒█░░ ░░▒█░░ ▒█▄▄█ ▒█▄▄▄ ▒█░▒█ ▒█▄▄▄ ▒█▄▄▄█ ▒█▄▄▄ ░▒█░░
*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
body {
line-height: 1;
}
ol, ul {
list-style: none;
}
blockquote, q {
quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
content: '';
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
/*
▒█▀▀▀█ ▀▀█▀▀ ▒█░░▒█ ▒█░░░ ▒█▀▀▀ ▒█▀▀▀█ ▒█░▒█ ▒█▀▀▀ ▒█▀▀▀ ▀▀█▀▀
░▀▀▀▄▄ ░▒█░░ ▒█▄▄▄█ ▒█░░░ ▒█▀▀▀ ░▀▀▀▄▄ ▒█▀▀█ ▒█▀▀▀ ▒█▀▀▀ ░▒█░░
▒█▄▄▄█ ░▒█░░ ░░▒█░░ ▒█▄▄█ ▒█▄▄▄ ▒█▄▄▄█ ▒█░▒█ ▒█▄▄▄ ▒█▄▄▄ ░▒█░░
*/
@font-face {
font-family: headingf;
src: url(header-font.ttf);
}
@font-face {
font-family: mainf;
src: url(main-font.ttf);
}
@font-face {
font-family: iconf;
src: url(icon.ttf);
}
.background_colour {
background-color: #c6cdd1;
height: 1700px;
position: relative;
left: 0px;
top: 0px;
z-index: 0;
}
.iconsf {
font-family: iconf;
font-size: 40px;
text-indent: 40px;
float: left;
}
.light-blue {
width: 1000px;
height: 500px;
position: relative;
background-color: #68cef3;
}
.dark-blueright {
width: 1000px;
height: 1000px;
background-color: #00aae7;
position: absolute;
left: 0px;
top: 0px;
z-index: -1;
}
.header-text {
font-family: headingf;
font-size: 170px;
position: inherit;
text-align: center;
top: 80px;
color: #ffffff;
letter-spacing: 10px
}
.welcome-text {
font-family: mainf;
font-size: 70px;
position: inherit;
text-align: center;
top: 60px;
color: #ffffff;
letter-spacing: 10px
}
.button-style1 {
position: relative;
top: 220px;
left: 400px;
background:-webkit-gradient( linear, left top, left bottom, color-stop(0.05, #00a9e7), color-stop(1, #00a9e7) );
background:-moz-linear-gradient( center top, #00a9e7 5%, #00a9e7 100% );
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#00a9e7', endColorstr='#00a9e7');
background-color:#00a9e7;
-webkit-border-top-left-radius:0px;
-moz-border-radius-topleft:0px;
border-top-left-radius:0px;
-webkit-border-top-right-radius:0px;
-moz-border-radius-topright:0px;
border-top-right-radius:0px;
-webkit-border-bottom-right-radius:0px;
-moz-border-radius-bottomright:0px;
border-bottom-right-radius:0px;
-webkit-border-bottom-left-radius:0px;
-moz-border-radius-bottomleft:0px;
border-bottom-left-radius:0px;
text-indent:-20px;
border:1px solid #ffffff;
display:inline-block;
color:#ffffff;
font-family:mainf;
font-size:15px;
font-weight:bold;
font-style:normal;
height:80px;
line-height:80px;
width:200px;
text-decoration:none;
text-align:center;
}
.button-style1:hover {
opacity: 0.6;
}
.button-style1:active {
opacity: 1;
}<!DOCTYPE html>
<html>
<link rel="stylesheet" type="text/css" href="style.css">
<body>
<div class="background_colour">
<div class="dark-blueright">
</div>
<div class="light-blue">
<div class="header-text">
Oh. Hello
</div>
<div class="welcome-text">
welcome
</div>
<a href="#" class="button-style1"><span class="iconsf">r</span>Goto art</a>
</div>
</div>
</body>
</html>