select.round{background-image:linear-gradient(45deg,transparent 50%,gray 0),linear-gradient(135deg,gray 50%,transparent 0),radial-gradient(#ddd 70%,transparent 72%);background-position:calc(100% - 20px) calc(1em + 2px),calc(100% - 15px) calc(1em + 2px),calc(100% - .5em) .5em}select.round,select.round:focus{background-size:5px 5px,5px 5px,1.5em 1.5em;background-repeat:no-repeat}select.round:focus{background-image:linear-gradient(45deg,#fff 50%,transparent 0),linear-gradient(135deg,transparent 50%,#fff 0),radial-gradient(gray 70%,transparent 72%);background-position:calc(100% - 15px) 1em,calc(100% - 20px) 1em,calc(100% - .5em) .5em;border-color:green;outline:0}select{background-color:#fff;border:thin solid blue;border-radius:4px;display:inline-block;font:inherit;line-height:1.5em;padding:.5em 3.5em .5em 1em;margin:0;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;-webkit-appearance:none;-moz-appearance:none}