This is a shape seemed to the shape you need, you have to make some tricks with the borders and transform, also you need use :after and :before selectors to build this kind of shapes.
#diamond-shield {
width: 0;
height: 40;
border: 50px solid transparent;
border-bottom: 50px solid orange;
position: relative;
top: -10px;
left: 250px;
transform-origin: 0% 0%;
transform: rotate(82deg)
}
#diamond-shield:after {
content: '';
position: absolute;
left: -50px; top: 50px;
width: 0;
height: 0;
border: 50px solid transparent;
border-top: 370px solid orange;
}
#chevron {
position: relative;
text-align: center;
padding: 8px;
top: -9px;
margin-bottom: 6px;
left:164px;
height: 0px;
width: 60px;
transform-origin: 0% 0%;
transform: rotate(-98deg);
}
#chevron:before {
content: '';
position: absolute;
top: 0;
left: 0;
height: 100%;
width: 51%;
background: white;
transform: skew(0deg, 44deg);
}
#chevron:after {
content: '';
position: absolute;
top: 0;
right: 0;
height: 100%;
width: 50%;
background: white;
transform: skew(0deg, -44deg);
}
<div id="diamond-shield"></div>
<div id="chevron"></div>
Also you could watch some examples here: https://css-tricks.com/examples/ShapesOfCSS/
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solved CSS custom shape [closed]