Close btn CSS
.close{
position: relative;
display: inline-block;
width: 16px;
height: 16px;
overflow: hidden;
cursor: pointer;
}
.close:before, .close:after {
content: '';
position: absolute;
height: 2px;
width: 100%;
top: 50%;
left: 0;
margin-top: -1px;
background: #000;
border-radius: 3px;
}
.close:before {
transform: rotate(45deg);
}
.close:after {
transform: rotate(-45deg);
}