<style>
div > div {
display: inline-block;
width: 150px;
height: 150px;
}
#topWide {
border: 5px solid black;
border-radius: 0px 0px 50px 50px;
border-top: 50px solid red;
}
#rightWide {
border: 5px solid black;
border-radius: 50px 0px 0px 50px;
border-right: 50px solid red;
}
#bottomWide {
border: 5px solid black;
border-radius: 50px 50px 0px 0px;
border-bottom: 50px solid red;
}
#leftWide {
border: 5px solid black;
border-radius: 0px 50px 50px 0px;
border-left: 50px solid red;
}
</style>
<div>
<div id="topWide"></div>
<div id="bottomWide"></div>
</div>
<div>
<div id="rightWide"></div>
<div id="leftWide"></div>
</div>