* { box-sizing: border-box; margin: 0; padding: 0; } body { margin: 0; padding: 0; } button{ width: 100%; font-size: 2em; } input, button, select{ width: 100%; font-size: 2em; } table { border: 1px; border-collapse: collapse; } td,th { border: 1px solid black; } /*div#content {*/ /*display: none;*/ /*}*/