tu-view-plus/es/src/checkbox/style/checkbox.css

.tu-checkbox {
  position: relative;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  height: 32px;
  line-height: 32px;
  white-space: nowrap;
  outline: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
  font-size: var(--tu-font-size-medium, 14px);
  font-weight: var(--tu-font-content-weight, normal);
  color: var(--tu-color-text, #71757f);
}
.tu-checkbox + .tu-checkbox {
  margin-left: 24px;
}
.tu-checkbox__input {
  white-space: nowrap;
  cursor: pointer;
  outline: none;
  display: inline-flex;
  position: relative;
  vertical-align: middle;
}
.tu-checkbox__original {
  opacity: 0;
  outline: none;
  position: absolute;
  z-index: -1;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
}

.tu-checkbox__inner {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  width: 18px;
  height: 18px;
  box-shadow: 3px 3px 6px var(--tu-color-shadow-dark, #babbc0), -2px -2px 5px var(--tu-color-shadow-light, #ffffff);
  border-radius: var(--tu-border-radius, 2px);
  border: 1px solid transparent;
  transition: box-shadow var(--tu-transition-duration-2, 0.2s);
}
.tu-checkbox__inner::after {
  content: "";
  position: absolute;
  box-sizing: content-box;
  border: 2px solid var(--tu-color-text-placeholder, #9b9fa8);
  border-left: 0;
  border-top: 0;
  height: 50%;
  transform: translate(10%, -10%) rotate(45deg) scaleY(1);
  width: 23%;
  transition: var(--tu-transition-duration-2, 0.2s) ease;
  transform-origin: center;
  transition: all var(--tu-transition-duration-2, 0.2s) ease;
}

.tu-checkbox__input.is-indeterminate .tu-checkbox__inner::after {
  box-sizing: content-box;
  content: "";
  position: absolute;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--tu-color-primary, #5e7ce0);
  border: none;
  height: 4px;
  width: 100%;
  transform: scale(0.5);
}

.tu-checkbox__label {
  font-size: var(--tu-font-size-medium, 14px);
  padding-left: 6px;
  transition: color var(--tu-transition-duration-2, 0.2s);
  line-height: 1;
}

.tu-checkbox.is-checked .tu-checkbox__inner {
  box-shadow: inset 2px 2px 5px var(--tu-color-shadow-dark, #babbc0), inset -2px -2px 5px var(--tu-color-shadow-light, #ffffff);
  border: none;
}
.tu-checkbox.is-checked .tu-checkbox__inner::after {
  border-color: var(--tu-color-primary, #5e7ce0);
}

.tu-checkbox.is-checked .tu-checkbox__label {
  color: var(--tu-color-primary, #5e7ce0);
}

.tu-checkbox.is-disabled {
  cursor: not-allowed;
  opacity: 0.7;
}
.tu-checkbox.is-disabled .tu-checkbox__inner {
  cursor: not-allowed;
  box-shadow: none;
  background: var(--tu-color-base-bg, rgba(128, 128, 128, 0.22));
}

.tu-checkbox--button {
  margin: 0 !important;
}
.tu-checkbox--button:hover {
  color: var(--tu-color-primary, #5e7ce0);
}
.tu-checkbox--button:not(:first-child)::after {
  content: "";
  display: block;
  height: 100%;
  width: 1px;
  position: absolute;
  top: 0;
  left: 0;
  box-shadow: inset 1px 1px 2px var(--tu-color-shadow-dark, #babbc0), inset -1px -1px 2px var(--tu-color-shadow-light, #ffffff), 1px 1px 3px var(--tu-color-shadow-dark, #babbc0), -1px -1px 2px var(--tu-color-shadow-light, #ffffff);
  opacity: 0.3;
}
.tu-checkbox--button .tu-checkbox__input {
  display: none;
}

.tu-checkbox--button .tu-checkbox__label {
  padding: 0 12px;
}

.tu-checkbox--button.is-checked {
  box-shadow: inset 2px 2px 5px var(--tu-color-shadow-dark, #babbc0), inset -2px -2px 5px var(--tu-color-shadow-light, #ffffff);
}

.tu-checkbox--border {
  box-shadow: 3px 3px 6px var(--tu-color-shadow-dark, #babbc0), -2px -2px 5px var(--tu-color-shadow-light, #ffffff);
  padding: 0 12px 0 4px;
  box-sizing: border-box;
  transition: box-shadow var(--tu-transition-duration-2, 0.2s);
}
.tu-checkbox--border + .tu-checkbox--border {
  margin-left: 12px;
}
.tu-checkbox--border::after {
  content: "";
  position: absolute;
  box-sizing: content-box;
  width: calc(100% - 2px);
  height: calc(100% - 2px);
  top: 0;
  left: 0;
  border: 1px solid transparent;
  border-radius: var(--tu-border-radius, 2px);
  transition: border var(--tu-transition-duration-2, 0.2s);
}
.tu-checkbox--border .tu-checkbox__inner {
  box-shadow: none;
  border: none;
}

.tu-checkbox--border.is-checked {
  box-shadow: inset 2px 2px 5px var(--tu-color-shadow-dark, #babbc0), inset -2px -2px 5px var(--tu-color-shadow-light, #ffffff);
  border: none;
}
.tu-checkbox--border.is-checked .tu-checkbox__inner {
  box-shadow: none;
}

.tu-checkbox--mini {
  font-size: var(--tu-font-size-mini, 10px);
  height: 24px;
  line-height: 24px;
}
.tu-checkbox--mini .tu-checkbox__inner {
  width: 14px;
  height: 14px;
}

.tu-checkbox--mini .tu-checkbox__label {
  font-size: var(--tu-font-size-mini, 10px);
}

.tu-checkbox--small {
  font-size: var(--tu-font-size-small, 12px);
  height: 28px;
  line-height: 28px;
}
.tu-checkbox--small .tu-checkbox__inner {
  width: 16px;
  height: 16px;
}

.tu-checkbox--small .tu-checkbox__label {
  font-size: var(--tu-font-size-small, 12px);
}

.tu-checkbox--medium {
  font-size: var(--tu-font-size-medium, 14px);
  height: 32px;
  line-height: 32px;
}
.tu-checkbox--medium .tu-checkbox__inner {
  width: 18px;
  height: 18px;
}

.tu-checkbox--medium .tu-checkbox__label {
  font-size: var(--tu-font-size-medium, 14px);
}

.tu-checkbox--large {
  font-size: var(--tu-font-size-large, 14px);
  height: 36px;
  line-height: 36px;
}
.tu-checkbox--large .tu-checkbox__inner {
  width: 20px;
  height: 20px;
}

.tu-checkbox--large .tu-checkbox__label {
  font-size: var(--tu-font-size-large, 14px);
}

.tu-checkbox:hover:not(.is-disabled, .is-checked) .tu-checkbox__inner {
  border-color: var(--tu-color-shadow-light, #ffffff);
  box-shadow: none;
}

.tu-checkbox:hover:not(.is-disabled, .is-checked).tu-checkbox--border {
  box-shadow: none;
}
.tu-checkbox:hover:not(.is-disabled, .is-checked).tu-checkbox--border::after {
  border-color: var(--tu-color-shadow-light, #ffffff);
}