.button {
    position: relative;
    cursor: pointer;
}

.button--special,
.button--special:after {
  width: 9.375rem;
  height: 3rem;
  line-height: 2.4;
  font-size: 1.25rem;
  font-family: var(--font-primary);
  font-weight: 400;
  font-style: normal;
  background: linear-gradient(45deg, transparent 5%, var(--color-background-button-primary) 5%);
  border: 0;
  color: #fff;
  letter-spacing: 3px;
  box-shadow: 6px 0px 0px var(--color-background-button-secondary);
  outline: transparent;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  margin-right: -0.0625rem;
}

.button--special:after {
  --slice-0: inset(50% 50% 50% 50%);
  --slice-1: inset(80% -6px 0 0);
  --slice-2: inset(50% -6px 30% 0);
  --slice-3: inset(10% -6px 85% 0);
  --slice-4: inset(40% -6px 43% 0);
  --slice-5: inset(80% -6px 5% 0);
  
  content: 'Přihlásit';
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 3%, var(--color-background-button-secondary) 3%, var(--color-background-button-secondary) 5%, var(--color-background-secondary) 5%);
  text-shadow: -3px -3px 0px var(--color-background), 3px 3px 0px var(--color-background-button-secondary);
  clip-path: var(--slice-0);
}

.button--special:hover:after {
  animation: 1s glitch;
  animation-timing-function: steps(2, end);
}

@media (min-width: 768px) {
    .button--special,
    .button--special:after {
      width: 12.5rem;
      height: 3rem;
    }
  }

@keyframes glitch {
  0% {
    clip-path: var(--slice-1);
    transform: translate(-20px, -10px);
  }
  10% {
    clip-path: var(--slice-3);
    transform: translate(10px, 10px);
  }
  20% {
    clip-path: var(--slice-1);
    transform: translate(-10px, 10px);
  }
  30% {
    clip-path: var(--slice-3);
    transform: translate(0px, 5px);
  }
  40% {
    clip-path: var(--slice-2);
    transform: translate(-5px, 0px);
  }
  50% {
    clip-path: var(--slice-3);
    transform: translate(5px, 0px);
  }
  60% {
    clip-path: var(--slice-4);
    transform: translate(5px, 10px);
  }
  70% {
    clip-path: var(--slice-2);
    transform: translate(-10px, 10px);
  }
  80% {
    clip-path: var(--slice-5);
    transform: translate(20px, -10px);
  }
  90% {
    clip-path: var(--slice-1);
    transform: translate(-10px, 0px);
  }
  100% {
    clip-path: var(--slice-1);
    transform: translate(0);
  }
}