html,
body {
    height: 100%;
    margin: 0px;
    padding: 0px;
    background-color: #2c2c2c;
    vertical-align: middle;
    text-align: center;
    cursor: pointer;
}

img.vk1,
img.ak1,
img.vk2,
img.ak2 {
    height: 100%;
    display: none;
}

.placeholder {
    height: 100%;
    display: none;
}