Make element fill any element

fill.css

.mmloader_container
{
	width: 100%;
	height: 100%;

	display: flex;
	display: -webkit-flex;

	align-items: center;
	justify-content: center;
	-webkit-align-items: center;
	-webkit-justify-content: center;
	background-color: #2c3e50;
}


.mmloader
{
	margin: 0;
	font-size: 10px;
	position: relative;
	text-indent: -9999em;
	border-top: 1.1em solid rgba(255, 255, 255, 0.2);
	border-right: 1.1em solid rgba(255, 255, 255, 0.2);
	border-bottom: 1.1em solid rgba(255, 255, 255, 0.2);
	border-left: 1.1em solid #ffffff;
	-webkit-transform: translateZ(0);
	-ms-transform: translateZ(0);
	transform: translateZ(0);
	-webkit-animation: load8 1.1s infinite linear;
	animation: load8 1.1s infinite linear;
	box-sizing: border-box;
}

.mmloader, .mmloader:after
{
	border-radius: 50%;
	width: 10em;
	height: 10em;
}

@-webkit-keyframes load8 
{
	0% 
	{
		-webkit-transform: rotate(0deg);
		transform: rotate(0deg);
	}
	100% 
	{
		-webkit-transform: rotate(360deg);
		transform: rotate(360deg);
	}
}

@keyframes load8 
{
	0% 
	{
		-webkit-transform: rotate(0deg);
		transform: rotate(0deg);
	}

	100% 
	{
		-webkit-transform: rotate(360deg);
		transform: rotate(360deg);
	}
}