.container{margin: auto;height: 200px;width: 400px;background-color: #ccc;position: absolute;top: 0;bottom: 0;left: 0;right: 0;overflow: hidden;}
.circle-1,.circle-2{height: 100px;width: 100px;border-radius: 50px;background-color: #fc0;}
.circle-1{position: absolute;top: -50px;left: -50px;}
.circle-2{position: absolute;bottom: -50px;right: -50px;}