الگو:مقدمه تک/styles.css

/* {{pp-template}} */
.introtosingle__main {
	position: relative;
	box-sizing: border-box;
	box-shadow: 2px 2px 2px #CCC;
	max-width: 100%;
	overflow: hidden;
	border: 1px solid black;
	margin: auto;
	padding-bottom: 20px;
}
.introtosingle__main-withbackground {
	background-image:url("https://upload.wikimedia.org/wikipedia/commons/9/94/Wikipedia-logo-v2_%2810_percent_opacity%29.svg");
	background-position: center -500px;
	background-repeat: no-repeat;
	background-size: auto 150%;
}
.introtosingle__main-title {
	font-size: 250%;
	line-height: 150%;
	background: #777;
	color: #FFF;
	text-align: center;
	align-items: center;
	justify-content: center;
}
.introtosingle__lead {
	background-color: #EEE; /* Fallback */
	background-color:rgba(221, 221, 221, 0.5);
	padding: 30px 60px;
	margin-bottom: 15px;
}
.introtosingle__base {
	box-sizing: border-box;
	max-width: 1100px;
	min-height: 55px;
	margin:auto;
	padding:5px 20px;
    font-size: 1.1em;
    background: #EEE;
    border: 1px solid lightgrey;
}
.introtosingle__columns {
	display: flex;
	flex-direction: row;
	flex-wrap: wrap-reverse;
	justify-content: center;
}
.introtosingle__columns-left,
.introtosingle__columns-left-noborder,
.introtosingle__columns-right {
	display:inline-block;
	flex:1 1 0;
	align-self:flex-end;
	vertical-align:top;
	min-width:200px;
	max-width:300px;
	padding:10px;
}
.introtosingle__columns-left {
	text-align:left;
	justify-content:left;
	border-left:solid 1px #ddd;
}
.introtosingle__columns-left-noborder {
	text-align:left;
	justify-content:left;
}
.introtosingle__columns-right {
	text-align:right;
	justify-content: right;
}
@media screen and (min-width: 1101px) {
	.introtosingle__main {
		max-width: 1100px;
	}
}