<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> #demo {
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
#demo {
width: 0;
height: 0;
border-width: 20px;
border-style: solid;
border-color: transparent transparent red transparent;
}
#zx {
width: 0;
height: 0;
border-width: 20px;
border-style: solid;
border-color: rgba(187,72,72,1) rgb(49, 38, 38) redrgba(128,73,73,1);
}
</style>
</head>
<body>
<div id="demo"></div>
<div id = 'zx'></div>
</body>
</html>
