/* Hide the default checkbox */
.container input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.container {
  display: block;
  position: relative;
  cursor: pointer;
  font-size: 25px;
  user-select: none;
}

/* Create a custom checkbox */
.checkmark {
  position: relative;
  top: 0;
  left: 0;
  height: 1.3em;
  width: 1.3em;
  background: black;
  border-radius: 50px;
  transition: all 0.7s;
  --spread: 20px;
}

/* When the checkbox is checked, add a blue background */
.container input:checked ~ .checkmark {
  background: rgb(0, 0, 0);
  box-shadow: -10px -10px var(--spread) 0px #5b51d8,
    0 -10px var(--spread) 0px #833ab4, 10px -10px var(--spread) 0px #e1306c,
    10px 0 var(--spread) 0px #fd1d1d, 10px 10px var(--spread) 0px #f77737,
    0 10px var(--spread) 0px #fcaf45, -10px 10px var(--spread) 0px #ffdc80;
}

/* Create the checkmark/indicator (hidden when not checked) */
.checkmark:after {
  content: "";
  position: absolute;
  display: none;
}

/* Show the checkmark when checked */
.container input:checked ~ .checkmark:after {
  display: block;
}

/* Style the checkmark/indicator */
.container .checkmark:after {
  left: 0.45em;
  top: 0.25em;
  width: 0.25em;
  height: 0.5em;
  border: solid #f0f0f0;
  border-width: 0 0.15em 0.15em 0;
  transform: rotate(40deg);
}