.box {
cursor: pointer;
height: 300px;
position: relative;
overflow: hidden;
width: 400px;
}
.box img {
position: absolute;
left: 0;
-webkit-transition: all 300ms ease-out;
-moz-transition: all 300ms ease-out;
-o-transition: all 300ms ease-out;
-ms-transition: all 300ms ease-out;
transition: all 300ms ease-out;
}
.box .overbox {
background-color: #304562;
position: absolute;
top: 0;
left: 0;
color: #fff;
z-index: 100;
-webkit-transition: all 300ms ease-out;
-moz-transition: all 300ms ease-out;
-o-transition: all 300ms ease-out;
-ms-transition: all 300ms ease-out;
transition: all 300ms ease-out;
opacity: 0;
width: 100%;
height: 100%;
padding: 130px 20px;
}
.box:hover .overbox { opacity: 1; }