#parentContainer {
  		width: 400px;
  		height: 400px;
  		background-color: #f55353;
	}
	#childContainer {
  		width: 100px;
  		height: 100px;
  		background-color: #feb139;
	}

	#loader {
  		position: absolute;
  		left: 44%;
  		top: 25%;
  		z-index: 1;
  		width: 100px;
  		height: 100px;
  		display: none;
  		border: 16px solid #f3f3f3;
  		border-radius: 50%;
  		border-top: 16px solid yellow;
  		border-right: 16px solid red ;
  		border-bottom: 16px solid lightgreen;
  		border-left: 16px solid lightblue;
  		animation: spin 2s linear infinite;
		}

		@keyframes spin {
  			0% { transform: rotate(0deg); }
  			100% { transform: rotate(360deg); }
		}