背景颜色渐变动态

#footer_wrapper footer {
	position: relative;
	width: 100%;
    height: 330px;
    padding-top: 50px;
	background: #0a9c46;
	background: linear-gradient(88deg, #f28c00, #0a9c46);
	background-size: 400% 400%;
	-webkit-animation: footer-bg 15s ease infinite;
	-moz-animation: footer-bg 15s ease infinite;
	animation: footer-bg 15s ease infinite;
}

@-webkit-keyframes footer-bg {
    0%{background-position:0% 51%}
    50%{background-position:100% 50%}
    100%{background-position:0% 51%}
}