* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.colors {
  --borderWidth: 5px;
  position: relative;
  width: 500px;
  display: flex;
  justify-content: space-around;
  margin: 20px auto;
  padding: 16px;
  background: white;
  border-radius: var(--borderWidth);
}

.colors::after {
  position: absolute;
  content: "";
  top: calc(-1 * var(--borderWidth));
  left: calc(-1 * var(--borderWidth));
  height: calc(100% + var(--borderWidth) * 2);
  width: calc(100% + var(--borderWidth) * 2);
  background: linear-gradient(
    60deg,
    #f79533,
    #f37055,
    #ef4e7b,
    #a166ab,
    #5073b8,
    #1098ad,
    #07b39b,
    #6fba82
  );
  border-radius: calc(2 * var(--borderWidth));
  z-index: -1;
  animation: animatedgradient 3s ease alternate infinite;
  background-size: 300% 300%;
}

@keyframes animatedgradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

li {
  width: 50px;
  height: 50px;
  border: 1px solid;
  border-radius: 50%;
  list-style-type: none;
}

li:hover {
  cursor: pointer;
  opacity: 0.8;
}

/* Specific colors */
.red {
  background-color: red;
  border-color: red;
}

.green {
  background-color: green;
  border-color: green;
}

.black {
  background-color: black;
  border-color: black;
}

.yellow {
  background-color: yellow;
  border-color: yellow;
}

.pink {
  background-color: pink;
  border-color: pink;
}

/* Border around selected color */
.selected {
  position: relative;
  opacity: 1;
}

.selected::before {
  position: absolute;
  content: "";
  width: 60px;
  height: 60px;
  top: -8px;
  right: -8px;
  border: 2px solid;
  border-color: inherit;
  border-radius: inherit;
}

/* Clear button */
button:hover {
  cursor: pointer;
}

#box {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 400px;
  height: 200px;
  color: white;
  font-family: "Raleway";
  font-size: 2.5rem;
}
.gradient-border {
  --borderWidth: 3px;
  background: #1d1f20;
  position: relative;
  border-radius: var(--borderWidth);
}
.gradient-border:after {
  content: "";
  position: absolute;
  top: calc(-1 * var(--borderWidth));
  left: calc(-1 * var(--borderWidth));
  height: calc(100% + var(--borderWidth) * 2);
  width: calc(100% + var(--borderWidth) * 2);
  background: linear-gradient(
    60deg,
    #f79533,
    #f37055,
    #ef4e7b,
    #a166ab,
    #5073b8,
    #1098ad,
    #07b39b,
    #6fba82
  );
  border-radius: calc(2 * var(--borderWidth));
  z-index: -1;
  animation: animatedgradient 3s ease alternate infinite;
  background-size: 300% 300%;
}

@keyframes animatedgradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}