To add bevel/angles to corners of header button, like this.
You can use this code to Custom CSS.
a.btn:after {
content: "";
width: 30px;
height: 30px;
display: block;
position: absolute;
left: -14px;
bottom: -15px;
background-color: #dbe0dc;
transform: rotate(45deg);
border-top: 2px solid #000;
}
a.btn:before {
content: "";
width: 30px;
height: 30px;
display: block;
position: absolute;
right: -15px;
top: -15px;
background-color: #dbe0dc;
transform: rotate(-135deg);
border-top: 2px solid #000;
}
a.btn {
position: relative;
}
If it doesn’t work properly, you can adjust these.
and these.



