.icon {
    width: 2em; height: 2em;
    vertical-align: -0.5em;
    fill: #f08300;
    overflow: hidden;
}
.icon-home:before { content: "\e657";}
.icon-back:before { content: "\e670";}

.header{z-index:50;width:100%;height: 4em;background-color: #f2f2f2;display: flex;justify-content: space-between;display: -webkit-flex;-webkit-justify-content: space-between;line-height: 4em;position: fixed;top:0px;}
.header .header_left{margin-left: 1em;}
.header .header_left{margin-right: 1em;}
.header .header_center{font-size: 1em;text-align: center;}