yii2-app-basic/web/css/site.css

body {
	padding-top: 70px;
}

.footer {
	border-top: 1px solid #ddd;
	margin-top: 30px;
	padding-top: 15px;
	padding-bottom: 30px;
}

.jumbotron {
	text-align: center;
	background-color: transparent;
}

.jumbotron .btn {
	font-size: 21px;
	padding: 14px 24px;
}