The demonstration at this codepen https://codepen.io/Chester/pen/QPoyjN showcases a border animation effect. While it works effectively with a white background, I am interested in making the box's background dynamic.
<div class="rainbow">
Rainbow border
</div>
If the div already has a class that determines its background, how can I make the background of the ::after element use the existing background?
Is there a way to clip the background from the content and only display the background specified by ::before on the borders?
Below is the SCSS code used for this magic:
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
*, *::before, *::after {
box-sizing: border-box;
}
@keyframes rotate {
100% {
transform: rotate(1turn);
}
}
.rainbow {
position: relative;
z-index: 0;
width: 400px;
height: 300px;
border-radius: 10px;
overflow: hidden;
padding: 2rem;
&::before {
content: '';
position: absolute;
z-index: -2;
left: -50%;
top: -50%;
width: 200%;
height: 200%;
background-color: #399953;
background-repeat: no-repeat;
background-size: 50% 50%, 50% 50%;
background-position: 0 0, 100% 0, 100% 100%, 0 100%;
background-image: linear-gradient(#399953, #399953), linear-gradient(#fbb300, #fbb300), linear-gradient(#d53e33, #d53e33), linear-gradient(#377af5, #377af5);
animation: rotate 4s linear infinite;
}
&::after {
content: '';
position: absolute;
z-index: -1;
left: 6px;
top: 6px;
width: calc(100% - 12px);
height: calc(100% - 12px);
background: white;
border-radius: 5px;
}
}