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.checkbox {
  display: block;
  position: relative;
  padding-left: 24px;
  margin-bottom: 6px;
  cursor: pointer;
}
.checkbox:hover input + .checkbox-mark {
  background-color: #f3f3f3;
}
.checkbox input {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
}
.checkbox input:checked + .checkbox-mark:after {
  display: block;
}
.checkbox .checkbox-mark {
  position: absolute;
  top: 3px;
  left: 0;
  height: 12px;
  width: 12px;
  border: 1px solid #333;
  background: #fff;
}
.checkbox .checkbox-mark:after {
  content: "";
  position: absolute;
  display: none;
  left: 2px;
  top: -2px;
  width: 6px;
  height: 10px;
  border: solid #333;
  border-width: 0 3px 3px 0;
  transform: rotate(45deg); /* add prefix if need */
}

.checkbox {
  display: block;
  position: relative;
  padding-left: 32px;
  margin-bottom: 12px;
  cursor: pointer;
  &:hover {
    input {
      & ~ .checkbox-mark {
        background-color: #f3f3f3;
      }
    }
  }
  input {
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    &:checked {
      & ~ .checkbox-mark {
        &:after {
          display: block;
        }
      }
    };
  }
  .checkbox-mark {
    position: absolute;
    top: 0;
    left: 0;
    height: 20px;
    width: 20px;
    border: 1px solid #333;
    border-radius: 2px;
    &:after {
      content: "";
      position: absolute;
      display: none;
      left: 6px;
      top: 2px;
      width: 7px;
      height: 12px;
      border: solid #333;
      border-width: 0 3px 3px 0;
      transform: rotate(45deg); /* add prefix if need */
    }
  }
}