body {
    background: #0a2240;
}

.logo{
    position: absolute;
    top:50%;
    left:50%;
    width:240px;
    height:335px;
    margin:-180px 0 0 -120px;
    background:url('../images/logo-white.png');
    background-size:  auto 335px;
}

.logo:hover{
    background:url('../images/logo-color.png');
    background-size:  auto 335px;
}