<button id="yukaricik"><i class="fa fa-chevron-up"></i> Yukarı Çık</button>

#yukaricik {
    display:none;
    position:fixed;
    z-index:999;
    bottom:10%;
    right:2.5%;
    padding:8px 8px;
    background:#5BA1CF;
}

button {
    border:none;
    padding:0.6em 1.2em;
    background:#c0392b;
    color:#fff;
    font-family:'Lato',Calibri,Arial,sans-serif;
    font-size:1em;
    letter-spacing:1px;
    text-transform:uppercase;
    cursor:pointer;
    display:inline-block;
    margin:3px 2px;
    border-radius:2px;
}