index.css

.y-checkbox__control
{
    position: absolute;
    z-index: -1;
    margin: 0;
    opacity: 0;
}
.y-checkbox_theme_normal {
  font-family: Arial, Helvetica, sans-serif;
}
.y-checkbox_theme_normal:hover {
  cursor: pointer;
}
.y-checkbox_theme_normal {
  position: relative;
  display: inline-block;
  border-radius: 3px;
  background: rgba(0,0,0,0.2);
}
.y-checkbox_theme_normal:before {
  position: absolute;
  top: 1px;
  right: 1px;
  bottom: 1px;
  left: 1px;
  content: '';
  border-radius: 2px;
  background: #fff;
}
.y-checkbox_theme_normal:after {
  position: absolute;
  top: -5px;
  left: 2px;
  content: '';
  background-image: url("tip.svg");
  background-size: 100%;
  visibility: hidden;
  opacity: 0;
  transition: transform 0.05s ease-out, opacity 0.05s ease-out, visibility 0s linear 0.05s;
}
.y-checkbox_theme_normal.y-checkbox_size_m {
  font-size: 13px;
}
.y-checkbox_theme_normal.y-checkbox_size_m {
  line-height: 14px;
  top: 2px;
  width: 14px;
  height: 14px;
  margin-right: 5px;
}
.y-checkbox_theme_normal.y-checkbox_size_m:after {
  width: 15px;
  height: 15px;
  transform: translateY(-5px);
}
.y-checkbox_theme_normal.y-checkbox_size_l {
  font-size: 15px;
}
.y-checkbox_theme_normal.y-checkbox_size_l {
  line-height: 17px;
  top: 3px;
  width: 17px;
  height: 17px;
  margin-right: 7px;
}
.y-checkbox_theme_normal.y-checkbox_size_l:after {
  width: 18px;
  height: 18px;
  transform: translateY(-7px);
}
.y-checkbox_theme_normal.y-checkbox_checked {
  background: rgba(153,122,0,0.5);
}
.y-checkbox_theme_normal.y-checkbox_checked:before {
  background: #ffeba0;
}
.y-checkbox_theme_normal.y-checkbox_checked:after {
  visibility: visible;
  opacity: 1;
  transform: translateY(0px);
  transition-delay: 0s;
}
.y-checkbox_theme_normal.y-checkbox_focused {
  box-shadow: 0 0 0 1px #fc0, inset 0 0 0 1px #fc0;
}
.y-checkbox_theme_normal.y-checkbox_hovered {
  background: rgba(0,0,0,0.3);
}
.y-checkbox_theme_normal.y-checkbox_hovered.y-checkbox_checked {
  background: rgba(129,103,0,0.6);
}
.y-checkbox_theme_normal.y-checkbox_disabled {
  cursor: default;
  color: #999;
}
.y-checkbox_theme_normal.y-checkbox_disabled {
  background: rgba(0,0,0,0.08);
}
.y-checkbox_theme_normal.y-checkbox_disabled:before {
  display: none;
}
.y-checkbox_theme_normal.y-checkbox_disabled.y-checkbox_checked:after {
  opacity: 0.4;
}