Edit in JSFiddle

.ust{position: fixed;top: 0;left: 0;z-index: 1;width: 100%;}
.yukle {height: 2px;margin-bottom: -2px;background: red;width: 0%;}
.main .content {margin: 0 auto;width: 500px;text-align:justify;font-size: 20px}