.loader,
.loader:before,
.loader:after {
	border-radius: 50%;
	width: 2.5em;
	height: 2.5em;
	-webkit-animation-fill-mode: both;
	animation-fill-mode: both;
	-webkit-animation: load7 1.8s infinite ease-in-out;
	animation: load7 1.8s infinite ease-in-out;
}
.loader {
	/* Hidden by default; shown explicitly (display:block) while the lesson SPA
	   loads. Non-lesson pages have no JS to hide it, so it must default to none
	   — otherwise it spins forever (previously only panel_menu.css hid it, which
	   isn't loaded on main-panel pages like show_excel_solution). */
	display: none;
	color: #4C7CA2;
	font-size: 10px;
	margin: 80px auto 140px auto;
	position: relative;
	text-indent: -9999em;
	-webkit-transform: translateZ(0);
	-ms-transform: translateZ(0);
	transform: translateZ(0);
	-webkit-animation-delay: -0.16s;
	animation-delay: -0.16s;
}
.loader-center {
	top: 40%;
	margin: auto;
	margin-top: -25px;
	-webkit-transform: translate(0, -50%); 
	transform: translate(0, -50%); 
}
.loader:before,
.loader:after {
	content: '';
	position: absolute;
	top: 0;
}
.loader:before {
	left: -3.5em;
	-webkit-animation-delay: -0.32s;
	animation-delay: -0.32s;
}
.loader:after {
	left: 3.5em;
}
@-webkit-keyframes load7 {
	0%,
	80%,
	100% {
		box-shadow: 0 2.5em 0 -1.3em;
	}
	40% {
		box-shadow: 0 2.5em 0 0;
	}
}
@keyframes load7 {
	0%,
	80%,
	100% {
		box-shadow: 0 2.5em 0 -1.3em;
	}
	40% {
		box-shadow: 0 2.5em 0 0;
	}
}