.header:after {
content: "253-256-7861";
width: 100px;
display: block;
padding: 6px 8px:
border radius: 0 0 5px 5px;
background: #lll;
font size: 16px;
text-align: center;
color: fff;
position: absolute;
top: 0;
right: 50%;
margin-right: -50%;
}