style.css

html{
  background: #fafafa;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
  cursor: default;
  font-family: "Open Sans", sans-serif;
  text-align: center;
}
#f{
  line-height: 1;
  font-size: 12px;
}
#cl{
  color: #5589ff;
  cursor: pointer;
}
button{
  background-color: rgba(255, 255, 255, 0.5);
  border: 1px solid #bbb;
  margin-right: 4px;
  cursor: pointer;
  font-size: 14px;
  padding: 3px 5px;
  border-radius: 2px;
  transition: all 0.2s;
}
button:focus{
  border-color: #888;
  outline: none;
}
button:hover{
  border-color: #888;
  background-color: rgba(245, 245, 245, 0.5);
}
button:active{
  border-color: #555;
  background-color: rgba(220, 220, 220, 0.5);
}
button[disabled]{
  color: #888;
  cursor: default;
  border: 1px solid #bbb;
  background-color: rgba(255, 255, 255, 0.5);;
  text-decoration: none;
}
a{
  text-decoration: none
}
a:hover{
  text-decoration: underline
}
#main{
  width: 880px;
  height: 560px;
  margin-left: calc(50% - 440px);
  background: white;
  box-shadow: 2px 2px 4px gray;
}
#main h2{
  line-height: 0;
  padding-top: 25px;
}
#main h3 button{
  vertical-align: bottom;
}
#main .selected{
  cursor: default;
  border: 1px solid #5eceff;
  box-shadow: 0px 0px 4px #0080ff;
}
.selected p{
  color: #c2f1ff;
}
.option{
  display: inline-block;
  cursor: pointer;
  box-shadow: 1px 1px 2px gray;
  border: 1px solid #aaa;
  height: 200px;
  width: 280px;
  position: relative;
  margin: 2px;
  transition: all 0.2s;
}
.optname{
  position: absolute;
  width: 280px;
  top: 40px;
  color: white;
  font-weight: 600;
  font-size: 36px;
  text-shadow: 2px 2px 4px black;
  transition: all 0.2s;
}
#main .optname_long{
  top: 15px;
}

.custom[type="checkbox"]:not(:checked),
.custom[type="checkbox"]:checked {
  position: absolute;
  left: -9999px;
}
.custom[type="checkbox"]:not(:checked) + label,
.custom[type="checkbox"]:checked + label {
  position: relative;
  padding-left: 27px;
  cursor: pointer;
}

/* checkbox aspect */
.custom[type="checkbox"]:not(:checked) + label:before,
.custom[type="checkbox"]:checked + label:before {
  content: '';
  position: absolute;
  left:0; top: 2px;
  width: 14px; height: 14px;
  border: 1px solid #aaa;
  background: #f8f8f8;
  border-radius: 3px;
  box-shadow: inset 0 1px 3px rgba(0,0,0,.3)
}
/* checked mark aspect */
.custom[type="checkbox"]:not(:checked) + label:after,
.custom[type="checkbox"]:checked + label:after {
  content: '✔';
  font-weight: 700;
  position: absolute;
  top: 6px; left: 3px;
  padding: 0;
  font-size: 13px;
  line-height: 0.8;
  color: #0a6dd0;
  transition: all .2s;
}
/* checked mark aspect changes */
.custom[type="checkbox"]:not(:checked) + label:after {
  opacity: 0;
  transform: scale(0);
}
.custom[type="checkbox"]:checked + label:after {
  opacity: 1;
  transform: scale(1);
}
/* disabled checkbox */
.custom[type="checkbox"]:disabled:not(:checked) + label:before,
.custom[type="checkbox"]:disabled:checked + label:before {
  box-shadow: none;
  border-color: #bbb;
  background-color: #ddd;
}
.custom[type="checkbox"]:disabled:checked + label:after {
  color: #999;
}
.custom[type="checkbox"]:disabled + label {
  color: #aaa;
}
/* accessibility */
.custom[type="checkbox"]:checked:focus + label:before,
.custom[type="checkbox"]:not(:checked):focus + label:before {
  border: 1px solid #0a367c;
}

.custom[type="checkbox"]:checked:hover + label:before,
.custom[type="checkbox"]:not(:checked):hover + label:before {
  border: 1px solid #3c68bf;
}

/* hover style just for information */
.custom label:hover:before {
  border: 1px solid #4778d9!important;
}

.clickable{
  color: #3e3eff;
  cursor: pointer;
}

.clickable:hover{
  text-decoration: underline;
}

.clickable:active{
  color: #ff0b56;
}

a, .clickable{
  transition: all 0.1s;
}

.alertify .alert>*, .alertify .dialog>*{
  width: 750px;
}