<div class="rect"></div>
<div class="c t l"></div>
<div class="c t r"></div>
<div class="c b l"></div>
<div class="c b r"></div>
<style>
body {
background: #F3AC3C;
margin: 0;
display: flex;
justify-content: center;
align-items: center;
}
.rect {
width: 140px;
height: 140px;
background: #1A4341;
transform: rotate(45deg)
}
.c {
position: absolute;
width: 200px;
height: 200px;
background: #F3AC3C;
border-radius: 50%;
}
.t { top: -50px }
.b { bottom: -50px }
.r { right: 0 }
.l { left: 0 }
</style>