HTML

<div class="hvr-curl-bottom-left"></div>
<div class="hvr-curl-bottom-right"></div>

CSS

.hvr-curl-bottom-right,
.hvr-curl-bottom-left {
    padding: 60px 60px;
    background: #294F6D;
    display: inline-block;
    vertical-align: middle;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    box-shadow: 0 0 1px rgba(0, 0, 0, 0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
}

.hvr-curl-bottom-right:before,
.hvr-curl-bottom-left:before {
    pointer-events: none;
    position: absolute;
    content: '';
    height: 0;
    width: 0;
    bottom: 0;
    background: white;
    transition: all 0.3s;
}

.hvr-curl-bottom-right:before {
    right: 0;
    background: linear-gradient(315deg, white 45%, #aaaaaa 50%, #cccccc 56%, white 80%);
    box-shadow: -1px -1px 1px rgba(0, 0, 0, 0.4);
}

.hvr-curl-bottom-left:before {
    left: 0;
    background: linear-gradient(45deg, white 45%, #aaaaaa 50%, #cccccc 56%, white 80%);
    box-shadow: 1px -1px 1px rgba(0, 0, 0, 0.4);
}

.hvr-curl-bottom-left:hover:before,
.hvr-curl-bottom-right:hover:before{
    width: 100px;
    height: 100px;
}