html, body {
    height: 100%;
    margin: 0px;
}
.arka{
    height: 100%;
    background-image: linear-gradient(to top, #fddb92 0%, #d1fdff 100%);  
    display: flex;
    justify-content: center;
}
.ark{
    width: 1280px;
    height: 720px;
    top: 15px;
    position: relative;
    background-image: url("res/arka.png");
}

.ana{
    align-items: center;
    width: 63px;
    height: 64px;
    position: absolute;
}
.ana_btn{
    background-image: url("res/ana.png");
}
.ana_btn:hover{    
    background-image: url("res/ana1.png");
}