.burj-khalifa {
height: 500px;
width: 250px;
margin: 50px auto;
position: relative;
}
.building {
position: absolute;
bottom: 0;
left: 50%;
transform: translateX(-50%);
width: 60px;
height: 400px;
background-color: #808080;
}
.top {
width: 100%;
height: 100px;
background-color: #808080;
border-radius: 50% 50% 0 0;
}
.middle {
width: 100%;
height: 200px;
background-color: #808080;
}
.bottom {
width: 100%;
height: 100px;
background-color: #808080;
border-radius: 0 0 50% 50%;
}