*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{

    background:#f4f4f4;

    font-family:tahoma;

}

.catalog{

    width:100%;
    max-width:900px;

    margin:auto;

    background:white;

}

.catalog img{

    width:100%;
    display:block;

    height:auto;

    user-select:none;

    -webkit-user-drag:none;

}