Background：box-sizing, transform
*{ box-sizing: border-box; } 1b4u8
<style>
main {
width: 100%;
padding: 60px 0;
display: flex;
justify-content: center;
align-items: center;
flex-wrap: wrap;
}
main > div.item {
min-width: 199px; height: 200px;
padding: 20px;
border: 1px solid #f5f5f5;
flex: 1;
display: flex;
justify-content: center;
align-items: center;
}
main > div.item:not(:nth-child(3n)):not(:last-child) {
border-right-width:0;
}
main .item > div {
box-sizing: content-box;
}
.trapezoid {
width: 80px; height: 0;
border: 40px solid #fff;
border-top: 0 solid;
border-bottom: 80px solid #b4a078;
}
.star-5-points {
width: 0; height: 0;
position: relative;
margin: 50px 0;
border: 80px solid rgba(0,0,0,0);
border-top: 0 solid;
border-bottom: 56px solid #b4a078;
transform: rotateZ(35deg);
}
.star-5-points::before {
content: "";
width: 0; height: 0;
position: absolute;
top: -36px; left: -52px;
border: 24px solid rgba(0,0,0,0);
border-top: 0 solid;
border-bottom: 64px solid #b4a078;
transform: rotateZ(-35deg);
}
.star-5-points::after {
content: "";
width: 0; height: 0;
position: absolute;
top: 3px; left: -86px;
border: 80px solid rgba(0,0,0,0);
border-top: 0 solid;
border-bottom: 56px solid #b4a078;
transform: rotateZ(-70deg);
}
.ribbon {
width: 0; height: 80px;
border: 40px solid #b4a078;
border-top: 0 solid;
border-bottom: 28px solid rgba(0,0,0,0);
}
.diamond {
width: 50px; height: 0;
position: relative;
margin: 20px 0 82px;
border: 25px solid rgba(0,0,0,0);
border-top-width: 0;
border-bottom-color: #b4a078;
}
.diamond::after {
content: "";
width: 0; height: 0;
position: absolute;
top: 25px; left: -25px;
border: 50px solid rgba(0,0,0,0);
border-top: 70px solid #b4a078;
border-bottom-width: 0;
}
.heart {
content: "";
display: block;
width: 100px;
min-height: 80px;
position: relative;
transform-origin: 50% 50% 0;
}
.heart:before {
content: "";
display: block;
width: 50px; height: 80px;
position: absolute;
top: 0; left: 50px;
border-radius: 50px 50px 0 0;
background: #b4a078;
transform: rotateZ(-45deg);
transform-origin: 0 100% 0;
}
.heart:after {
content: "";
display: block;
width: 50px; height: 80px;
position: absolute;
top: 0; left: 0;
border-radius: 50px 50px 0 0;
background: #b4a078;
transform: rotateZ(45deg);
transform-origin: 100% 100% 0;
}
.army-chevron {
width: 200px; height: 60px;
position: relative;
margin: 0 0 6px;
padding: 12px;
text-align: center;
}
.army-chevron::before {
content: "";
width: 51%; height: 100%;
position: absolute;
top: 0; left: 0;
background: #b4a078;
transform: skewY(6deg);
}
.army-chevron::after {
content: "";
width: 50%; height: 100%;
position: absolute;
top: 0; right: 0;
background: #b4a078;
transform: skewY(-6deg);
}
</style>
<main>
<div class="item"><div class="trapezoid"></div></div>
<div class="item"><div class="star-5-points"></div></div>
<div class="item"><div class="ribbon"></div></div>
<div class="item"><div class="diamond"></div></div>
<div class="item"><div class="heart"></div></div>
<div class="item"><div class="army-chevron"></div></div>
</main>