.previous_page{
     position: fixed;
    top: 26px;
    left: 85%;
    display: block;
    z-index: 999;
    }

.previous_page button{
background: #8E8537;
border-radius:4px; -moz-border-radius:4px; -webkit-border-radius:4px;
padding: 4px 10px;
color: #fff;
border-color: transparent;
font-size: medium;
}