Square spinner gradient effect

Square spinner gradient effect

by Csaba Hellinger

HTML

<div class="outer">
  <div class="gradient"></div>
  <div class="inner">
    <h1>Hello</h1>
    <p>Look at that crazy ass border effect around this box!</p>
  </div>
</div>

CSS

body {
    --color: #e4ba12;
    --bg: #386b9a;
  background: var(--bg);
  font-family: sans-serif;
  padding: 2rem;
}

.outer {
  position: relative;
  display: inline-block;
  overflow: hidden;
  padding: 1rem;
  text-align: center;
  background: transparent;
  color: var(--color);
}

.gradient {
  position: absolute;
  top: -100%;
  left: -100%;
  bottom: -100%;
  right: -100%;
  background: conic-gradient(from 0deg, transparent 0%, transparent 50%, var(--color));
  animation: rotate 1s linear infinite;
}

.inner {
  width: 15rem;
  transform: rotate(0deg);
  padding: 1rem;
  background: var(--bg);
}

@keyframes rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}