Init

core/bitrix/js/rest/css/applayout.css

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+.app-frame
+{
+	width: 100%;
+	height: 100%;
+	border-radius: var(--ui-border-radius-md);
+}
+
+.app-frame-layout
+{
+	width: 100%;
+	height: 100%;
+	position: relative;
+	z-index: 2;
+	opacity: 1;
+	background-color: white;
+	-webkit-transition: opacity 0.25s ease-in;
+	-moz-transition: opacity 0.25s ease-in;
+	-ms-transition: opacity 0.25s ease-in;
+	-o-transition: opacity 0.25s ease-in;
+	transition: opacity 0.25s ease-in;
+	border-radius: var(--ui-border-radius-md);
+}
+
+.app-loading
+{
+	opacity: 0;
+}
+
+.app-loading-msg:before {
+	display: inline-block;
+	content: '';
+	min-width: 29px;
+	min-height: 29px;
+	background: url(/bitrix/js/main/core/images/wait-big.gif) no-repeat scroll center center transparent;
+	margin-right: 10px;
+}
+
+.app-loading-msg {
+	color: #555;
+	font-size: 20px;
+	position: absolute;
+	z-index: 1;
+	left: 10px;
+	right: 10px;
+	top: 0;
+	bottom: 0;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+}
+
+.app-expand-popup .app-loading-msg
+{
+	height: 100%;
+}
+
+.app-loading-popup
+{
+	background: url("/bitrix/js/main/core/images/wait-big.gif") no-repeat scroll center center transparent;;
+	color: #555555;
+	height: 300px;
+	width: 300px;
+	font-size: 20px;
+	text-align: center;
+	position: relative;
+	z-index: 1;
+}
+
+.task-switcher-block > .app-frame-layout > .app-frame,
+.crm-entity-section > .app-frame-layout > .app-frame{
+	min-height: 600px;
+}

core/bitrix/js/rest/css/applayout.min.css

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+.app-frame{width:100%;height:100%;border-radius:var(--ui-border-radius-md)}.app-frame-layout{width:100%;height:100%;position:relative;z-index:2;opacity:1;background-color:white;-webkit-transition:opacity .25s ease-in;-moz-transition:opacity .25s ease-in;-ms-transition:opacity .25s ease-in;-o-transition:opacity .25s ease-in;transition:opacity .25s ease-in;border-radius:var(--ui-border-radius-md)}.app-loading{opacity:0}.app-loading-msg:before{display:inline-block;content:'';min-width:29px;min-height:29px;	background: url(/bitrix/js/main/core/images/wait-big.gif) no-repeat scroll center center transparent; margin-right:10px}.app-loading-msg{color:#555;font-size:20px;position:absolute;z-index:1;left:10px;right:10px;top:0;bottom:0;display:flex;align-items:center;justify-content:center}.app-expand-popup .app-loading-msg{height:100%;}
+
+.app-loading-popup
+{
+	background: url("/bitrix/js/main/core/images/wait-big.gif") no-repeat scroll center center transparent;; color:#555;height:300px;width:300px;font-size:20px;text-align:center;position:relative;z-index:1}.task-switcher-block>.app-frame-layout>.app-frame,.crm-entity-section>.app-frame-layout>.app-frame{min-height:600px}