body {
    padding: 0;
    margin: 0;
    background: #d7f1f9;
}
img {
    vertical-align: bottom;
    line-height: 1.0em;
    padding: 0;
    margin: 0;
    display: block;
    max-width: 100%;
}
.contents {
    margin: auto;
    max-width: 750px;
}

a img {
    width: 100%;
}