body{
    font-family: 'Courier New', Courier, monospace;
    background-color: #efefef;
    
}
.proset{
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 20%;
}

.menu{
text-align: center;
}

.obrazky{
    display: block;
    margin-left: auto;
    margin-right: auto;

    background-color: #ffffff;
    height: 940px;
    width: 720px;
}