.mb{
display: block !important;
}

.mb a,.mb a:visited{
font-weight: bold;
font-size: 40px;
position: fixed;
left: 40%;
background-color: #fff;
border: 1px solid #ccc;
border-radius:5px;
padding: 10px;
box-shadow: 5px 5px 5px rgba(0,0,0,0.4);
bottom: 15px;
text-align: center;
color: #FFA500;
text-decoration: none;
}