문제

풀이
HTML
<div class="container">
<div class="circle">
<div class="check"></div>
</div>
</div>
CSS
* {
box-sizing: border-box;
margin: 0;
}
.container {
display: flex;
justify-content: center;
align-items: center;
width: 100vw;
height: 100vh;
}
.circle {
position: relative;
width: 240px;
height: 240px;
border-radius: 50%;
background: #5A9F48;
}
.check {
position: absolute;
top: 145px;
left: 145px;
width: 70px;
height: 140px;
border-width: 0px 40px 40px 0px;
border-style: solid;
border-color: #FFFFFF;
transform: translate(-50%, -50%) rotate(45deg);
}