.square, .circle {width: 100px;height: 100px;}
.circle {border-radius: 50%;}

#blockRed {background-color: red;}#blockYellow {background-color: yellow;}


.square, .circle {width: 100px;height: 100px;display: block;}

#container {background-color: blue;margin: 0 auto;width: 400px;}

#blockRed {background-color: red;position: relative;right:-300px}
#blockYellow {background-color: yellow;position: relative;right:-00px}

.triangle {
	width: 0;
	height: 0;
	border-left: 200px solid transparent;
	border-right: 200px solid transparent;
	border-bottom: 400px solid #555;
    position: relative;top:-400px;right:-512px;z-index: 1;border-color:transparent transparent darkorange transparent}

html {background-image: url('sand.jpg');background-size: 100%}

.return2{text-align: center;position: relative;top:-300px}