.sizer *, .sizer *:before, .sizer *:after
{ box-sizing: border-box; margin:0; padding:0;}
.sizer p { font-style: italic; padding-top: 0.25rem; font-size:0.75rem }
.sizer { position: relative; width:100%; margin-top:1.3125rem}
.sizer:after { padding-bottom:50%; /* 1/aspect */ }
canvas { width:100%; height:100%; outline: 1px solid #333;}