.reveal {
	font-size: 48px;
}
.reveal .slides {
	z-index: 20;
}
.reveal h6 {
	position: absolute;
	right: 0;
	text-align: right;
	top: -1.5em;
}
.reveal pre {
	font-size: .75em;
	white-space: pre;
	width: 100%;
}
.reveal pre.large {
	font-size: 1em;
}
.reveal pre.small {
	font-size: .65em;
}
/** add class that has smaller font by default and bigger when it's an important code **/
.reveal pre code {
	max-height: none;
	padding: 15px;
}

.reveal .mainFooter {
	bottom: 5px;
	border-top: solid 1px #d3d3d3;
	display: flex;
	font-size: 18px;
	left: 2%;
	justify-content: space-between;;
	padding: 5px;
	position: absolute;
	text-align: center;
	width: 96%;
	z-index: 11;
}

.reveal {
	font-size: 48px;
}
.reveal .slides {
	z-index: 20;
}
.reveal h6 {
	position: absolute;
	right: 0;
	text-align: right;
	top: -1.5em;
}
.reveal pre {
	font-size: .75em;
	white-space: pre;
	width: 100%;
}
.reveal pre.large {
	font-size: 1em;
}
.reveal pre.small {
	font-size: .65em;
}
/** add class that has smaller font by default and bigger when it's an important code **/
.reveal pre code {
	max-height: none;
	padding: 15px;
}

.reveal .mainFooter {
	bottom: 0;
	border-top: solid 1px #d3d3d3;
	display: flex;
	font-size: 23px;
	left: 2%;
	justify-content: space-between;;
	padding: 5px;
	position: absolute;
	text-align: center;
	width: 96%;
	z-index: 11;
}

Make footer a little bit bigger
Make footer a little bit bigger
