<div class="a"></div>
<div class="b"></div>
<style>
body {
background: #0B2429;
display: flex;
align-items: center;
justify-content: center;
}
div {
position: absolute;
}
.a {
background: #998235;
width: 200px;
height: 200px;
border-radius: 50% 0;
transform: rotate(45deg);
}
.b {
background: #0B2429;
width: 50px;
height: 50px;
border-radius: 50%;
border: 45px solid #F3AC3C;
outline: 20px solid #0B2429;
}
</style>