.resize-triggers {
    visibility: hidden;
}

.resize-triggers,
.resize-triggers > div,
.contract-trigger:before {
    content: " ";
    display: block;
    position: absolute;
    left: 0; top: 0;

    width: 100%;
    height: 100%;
    overflow: hidden;
}

.contract-trigger:before {
    width: 200%;
    height: 200%;
}