문제

풀이
<div class="container">
<div class="mailbox mailbox-front"></div>
<div class="mailbox mailbox-side"></div>
<div class="pillar pillar-front"></div>
<div class="pillar pillar-side"></div>
</div>
* {
margin: 0;
box-sizing: border-box;
}
.container {
position: relative;
width: 100vw;
height: 100vh;
background: #A4C5BD;
}
.mailbox {
position: absolute;
border-radius: 50px 50px 0 0;
}
.mailbox-front {
top: 80px;
left: 105px;
z-index: 1;
width: 100px;
height: 140px;
background: #8D424D;
}
.mailbox-side {
top: 80px;
left: 105px;
width: 190px;
height: 140px;
background: #D96C7B;
}
.pillar {
position: absolute;
}
.pillar-front {
bottom: 0px;
right: 155px;
z-index: 1;
width: 10px;
height: 80px;
background: #8D424D;
}
.pillar-side {
bottom: 0px;
right: 135px;
width: 28px;
height: 80px;
background: #D96C7B;
}