.exp {
  display: table;
  width: 100%;
  height: 100%;
}
.exp .checkbox {
  display: table-cell;
  width: 100%;
  height: 100%;
  vertical-align: middle;
  text-align: center;
}

label {
  display: inline-block;
  color: black;
  cursor: pointer;
  position: relative;
}
label span {
  display: inline-block;
  position: relative;
  background-color: transparent;
  width: 25px;
  height: 25px;
  transform-origin: center;
  border: 2px solid #1790b5;
  border-radius: 50%;
  vertical-align: -6px;
  margin-right: 10px;
  transition: background-color 150ms 200ms, transform 350ms cubic-bezier(0.78, -1.22, 0.17, 1.89);
}
label span:before {
  content: "";
  width: 0px;
  height: 2px;
  border-radius: 2px;
  background: #1790b5;
  position: absolute;
  transform: rotate(45deg);
  top: 13px;
  left: 9px;
  transition: width 50ms ease 50ms;
  transform-origin: 0% 0%;
}
label span:after {
  content: "";
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: #1790b5;
  position: absolute;
  transform: rotate(305deg);
  top: 16px;
  left: 10px;
  transition: width 50ms ease;
  transform-origin: 0% 0%;
}
label:hover span:before {
  width: 5px;
  transition: width 100ms ease;
}
label:hover span:after {
  width: 10px;
  transition: width 150ms ease 100ms;
}

input[type="checkbox"] {
  display: none;
}
input[type="checkbox"]:checked + label span {
  background-color: #1790b5;
  transform: scale(1.25);
}
input[type="checkbox"]:checked + label span:after {
  width: 10px;
  background: white;
  transition: width 150ms ease 100ms;
}
input[type="checkbox"]:checked + label span:before {
  width: 5px;
  background: white;
  transition: width 150ms ease 100ms;
}
input[type="checkbox"]:checked + label:hover span {
  background-color: #1790b5;
  transform: scale(1.25);
}
input[type="checkbox"]:checked + label:hover span:after {
  width: 10px;
  background: black;
  transition: width 150ms ease 100ms;
}
input[type="checkbox"]:checked + label:hover span:before {
  width: 5px;
  background: black;
  transition: width 150ms ease 100ms;
}