html {
    height: 100%;
}

body {
    background: #fff;
    height: 100%;
    margin: 0;
    padding: 0;
}

.main {
    display: flex;
    margin: 0 auto;
    max-width: 1200px;
    height: 100%;
}

.main img {
    display: inline-block;
    max-width: 100%;
    vertical-align: middle;
}