2 <html style=
"height: 100%">
3 <body style=
"height: 100%">
4 <fieldset style=
"position: relative; display: table; width: 50%;
5 height: 50%; top: 25%; left: 25%">
6 <div style=
"position: absolute; left: 0; right: 0; top: 0; bottom: 0;
7 background: green"></div>