.Inhalt {display:block;
            position: absolute;
            position: relative;
            top: 0;
            max-width: 900px; 
            min-width: 200px; 
            margin-left: auto; 
            margin-right: auto; 
            padding: 10px;
            clear: both;
            background-color: yellowgreen;
            }
tr.position {background-color: yellow;}
@media (max-width: 630px)   {
    .Inhalt  {max-width: 100vw} 
}