HTML

CSS

JS

.custom-checklist {
  --background: #fff;
  --text: #414856;
  --check: #4f29f0;
  --disabled: #c3c8de;
  --width: 100px;
  --height: 100px;
  --border-radius: 10px;
  background: var(--background);
  width: var(--width);
  height: var(--height);
  border-radius: var(--border-radius);
  position: relative;
  box-shadow: 0 10px 30px rgba(65, 72, 86, 0.05);
  padding: 30px 85px;
  display: grid;
  grid-template-columns: 30px auto;
  align-items: center;
  justify-content: center;
}

.custom-checklist label {
  color: var(--text);
  position: relative;
  cursor: pointer;
  display: grid;
  align-items: center;
  width: fit-content;
  transition: color 0.3s ease;
  margin-right: 20px;
}

.custom-checklist label::before,
.custom-checklist label::after {
  content: "";
  position: absolute;
}

.custom-checklist label::before {
  height: 2px;
  width: 8px;
  left: -27px;
  background: var(--check);
  border-radius: 2px;
  transition: background 0.3s ease;
}

.custom-checklist label:after {
  height: 4px;
  width: 4px;
  top: 8px;
  left: -25px;
  border-radius: 50%;
}

.custom-checklist input[type="checkbox"] {
  appearance: none;
  position: relative;
  height: 15px;
  width: 15px;
  outline: none;
  border: 0;
  margin: 0 15px 0 0;
  cursor: pointer;
  background: var(--background);
  display: grid;
  align-items: center;
  margin-right: 20px;
}

.custom-checklist input[type="checkbox"]::before,
.custom-checklist input[type="checkbox"]::after {
  content: "";
  position: absolute;
  height: 2px;
  top: auto;
  background: var(--check);
  border-radius: 2px;
}

.custom-checklist input[type="checkbox"]::before {
  width: 0px;
  right: 60%;
  transform-origin: right bottom;
}

.custom-checklist input[type="checkbox"]::after {
  width: 0px;
  left: 40%;
  transform-origin: left bottom;
}

.custom-checklist input[type="checkbox"]:checked::before {
  animation: check-01 0.4s ease forwards;
}

.custom-checklist input[type="checkbox"]:checked::after {
  animation: check-02 0.4s ease forwards;
}

.custom-checklist input[type="checkbox"]:checked+label {
  color: var(--disabled);
  animation: move 0.3s ease 0.1s forwards;
}

.custom-checklist input[type="checkbox"]:checked+label::before {
  background: var(--disabled);
  animation: slice 0.4s ease forwards;
}

.custom-checklist input[type="checkbox"]:checked+label::after {
  animation: firework 0.5s ease forwards 0.1s;
}

@keyframes move {
  50% {
    padding-left: 8px;
    padding-right: 0px;
  }
  100% {
    padding-right: 4px;
  }
}

@keyframes slice {
  60% {
    width: 100%;
    left: 4px;
  }
  100% {
    width: 100%;
    left: -2px;
    padding-left: 0;
  }
}

@keyframes check-01 {
  0% {
    width: 4px;
    top: auto;
    transform: rotate(0);
  }
  50% {
    width: 0px;
    top: auto;
    transform: rotate(0);
  }
  51% {
    width: 0px;
    top: 8px;
    transform: rotate(45deg);
  }
  100% {
    width: 5px;
    top: 8px;
    transform: rotate(45deg);
  }
}

@keyframes check-02 {
  0% {
    width: 4px;
    top: auto;
    transform: rotate(0);
  }
  50% {
    width: 0px;
    top: auto;
    transform: rotate(0);
  }
  51% {
    width: 0px;
    top: 8px;
    transform: rotate(-45deg);
  }
  100% {
    width: 10px;
    top: 8px;
    transform: rotate(-45deg);
  }
}

@keyframes firework {
  0% {
    opacity: 1;
    box-shadow: 0 0 0 -2px #4f29f0, 0 0 0 -2px #4f29f0, 0 0 0 -2px #4f29f0, 0 0 0 -2px #4f29f0, 0 0 0 -2px #4f29f0, 0 0 0 -2px #4f29f0;
  }
  30% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    box-shadow: 0 -15px 0 0px #4f29f0, 14px -8px 0 0px #4f29f0, 14px 8px 0 0px #4f29f0, 0 15px 0 0px #4f29f0, -14px 8px 0 0px #4f29f0, -14px -8px 0 0px #4f29f0;
  }
}

Modern Light Theme Checklist

Modern light-themed checkboxes that look like a checklist. When an item is checked off, it displays a firework-like animation and crosses out the item to indicate it is completed.

This UI element is great for building a checklist or to-do list. It comes with a few CSS variables that you can change to alter the look and feel.