.f15 {  font-size: 15px; line-height: 130%}
.f13 {  font-size: 13px; line-height: 130%}
.mt10 { margin-top: 10px;}
.mb10 { margin-bottom: 10px;}
.mb20 { margin-bottom: 20px;}
.mr20 { margin-right: 20px;}
.center { text-align: center;}
.works_img { width: 690px;}
.works_img img { display: inline-block; width: 300px;}