ingredients.css

#checklist {
  --background: none;
  --text: #444444;
  --check: #444444;
  --disabled: #4d0000;
  --border-radius: 10px;
  background: var(--background);
  width: var(--width);
  height: var(--height);
  border-radius: var(--border-radius);
  position: relative;
  -webkit-box-shadow: none;
          box-shadow: none;
  padding: 30px 45px;
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 30px auto;
      grid-template-columns: 30px auto;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

#checklist label {
  color: var(--text);
  position: relative;
  cursor: pointer;
  display: -ms-grid;
  display: grid;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  width: -webkit-fit-content;
  width: -moz-fit-content;
  width: fit-content;
  -webkit-transition: color .3s ease;
  transition: color .3s ease;
}

#checklist label::before, #checklist label::after {
  content: "";
  position: absolute;
}

#checklist label::before {
  height: 2px;
  width: 8px;
  left: -27px;
  background: var(--check);
  border-radius: 2px;
  -webkit-transition: background .3s ease;
  transition: background .3s ease;
}

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

#checklist input[type="checkbox"] {
  -webkit-appearance: none;
  -moz-appearance: none;
  position: relative;
  height: 15px;
  width: 15px;
  outline: none;
  border: 0;
  margin: 0 15px 0 0;
  cursor: pointer;
  background: var(--background);
  display: -ms-grid;
  display: grid;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

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

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

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

#checklist input[type="checkbox"]:checked::before {
  -webkit-animation: check-01 .4s ease forwards;
          animation: check-01 .4s ease forwards;
}

#checklist input[type="checkbox"]:checked::after {
  -webkit-animation: check-02 .4s ease forwards;
          animation: check-02 .4s ease forwards;
}

#checklist input[type="checkbox"]:checked + label {
  color: var(--disabled);
  -webkit-animation: move .3s ease .1s forwards;
          animation: move .3s ease .1s forwards;
}

#checklist input[type="checkbox"]:checked + label::before {
  background: var(--disabled);
  -webkit-animation: slice .4s ease forwards;
          animation: slice .4s ease forwards;
}

#checklist input[type="checkbox"]:checked + label::after {
  -webkit-animation: firework .5s ease forwards .1s;
          animation: firework .5s ease forwards .1s;
}

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

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

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

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

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

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

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

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

@-webkit-keyframes firework {
  0% {
    opacity: 1;
  }
  30% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

@keyframes firework {
  0% {
    opacity: 1;
  }
  30% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}