[class*="btn-"] {
  outline: 0;
  border-radius: 50px;
  font-size: 0.8em;
  font-family: 'Roboto', sans-serif;
  font-weight: 400;
  letter-spacing: 4px;
  overflow: hidden;
  position: relative;
  padding: 2em 3em;
  margin: 4em;
  text-transform: uppercase;
  -webkit-tap-highlight-color: transparent;
  -webkit-transition: all 500ms ease-in-out;
  transition: all 500ms ease-in-out;
}
[class*="btn-"]::after, [class*="btn-"]::before {
  content: "";
  position: absolute;
}
[class*="btn-"]:hover, [class*="btn-"]:focus {
  background: rgba(255, 255, 255, 0.8);
}

[class*="btn-mix"]::after {
  background: #222;
  border-radius: 120px;
  content: attr(data-text);
  color: #fff;
  padding: 1.6em 2.5em;
  top: 0.4em;
  left: 0.5em;
  -moz-user-select: none;
  -webkit-user-select: none;
      -ms-user-select: none;
          user-select: none;
  user-drag: none;
}
[class*="btn-mix"]::before {
  background: transparent;
  border-radius: 100%;
  top: 50%;
  left: 50%;
  box-shadow: 0 1em 2em 3em rgba(255, 50, 0, 0.5), 4em 0em 2em 2em rgba(155, 50, 0, 0.6), -4em -2em 2em 2em rgba(255, 0, 150, 0.5), -4em 2em 2em 4em rgba(0, 0, 150, 0.5), 0 -3em 2em 3em rgba(120, 250, 0, 0.5), 2em -1em 2em 2em rgba(50, 10, 200, 0.5);
  width: 0;
  height: 0;
  -webkit-animation: mix 5s linear infinite;
          animation: mix 5s linear infinite;
}

@-webkit-keyframes mix {
  30% {
    box-shadow: 0 -1em 2em 3em rgba(255, 0, 200, 0.5), 4em -1em 2em 3em rgba(255, 50, 0, 0.8), -4em 2em 3em 2em rgba(155, 200, 0, 0.5), -4em -2em 2em 2em rgba(200, 0, 150, 0.6), 0 3em 2em 2em rgba(20, 250, 0, 0.5), 2em 1em 2em 2em rgba(50, 10, 250, 0.5);
  }
  60% {
    box-shadow: 2em 1em 2em 3em rgba(55, 0, 200, 0.5), 3em 1em 2em 3em rgba(25, 150, 0, 0.6), 3em -2em 3em 3em rgba(155, 200, 0, 0.5), -4em 2em 2em 3em rgba(200, 0, 50, 0.6), 0 -3em 2em 3em rgba(200, 250, 0, 0.5), -2em 1em 2em 3em rgba(50, 210, 250, 0.6);
  }
}

@keyframes mix {
  30% {
    box-shadow: 0 -1em 2em 3em rgba(255, 0, 200, 0.5), 4em -1em 2em 3em rgba(255, 50, 0, 0.8), -4em 2em 3em 2em rgba(155, 200, 0, 0.5), -4em -2em 2em 2em rgba(200, 0, 150, 0.6), 0 3em 2em 2em rgba(20, 250, 0, 0.5), 2em 1em 2em 2em rgba(50, 10, 250, 0.5);
  }
  60% {
    box-shadow: 2em 1em 2em 3em rgba(55, 0, 200, 0.5), 3em 1em 2em 3em rgba(25, 150, 0, 0.6), 3em -2em 3em 3em rgba(155, 200, 0, 0.5), -4em 2em 2em 3em rgba(200, 0, 50, 0.6), 0 -3em 2em 3em rgba(200, 250, 0, 0.5), -2em 1em 2em 3em rgba(50, 210, 250, 0.6);
  }
}
.btn-mix-noborder::after {
  background: transparent !important;
  color: #222 !important;
}

.btn-mix-noRadius {
  border-radius: 0 !important;
}
.btn-mix-noRadius::after, .btn-mix-noRadius::before {
  border-radius: 0 !important;
}

html,
body {
  width: 100%;
  height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizelegibility;
}

body {
  background: #222;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

a {
  text-decoration: none;
}