<div class="circle">
<span class="circle__number">
1
</span>
</div>
.circle {
width: 100px;
height: 100px;
border-radius: 100px;
background-color: red;
display: flex;
justify-content: center;
align-items: center;
}
.circle__number {
color: #fff;
font-size: 70px;
font-weight: bold;
}