.wrap {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
}    
header.border-bottom{border-bottom:2px solid #3e56a5 !important;}
h1.title_act{margin-left:1em; font-size: 1.5em;}
.linkback{font-size:86%;text-align: right;}

@media (max-width: 980px) {
    .main_header{flex-direction: column;align-items: flex-start !important;}
    h1.title_act {margin-left: 0; margin-top: 10px;}
    .linkback {width: 100%;text-align: right;  margin-top: 10px;}
    }

@media (max-width: 480px) {
    h1.title_act {font-size: 1.3em;}
    }