<style>
.outer {
border: 4px solid black;
width: 100px;
height: 100px;
border-radius: 40px;
background-color: lightblue;
overflow: hidden;
margin: 10px;
}
.inner {
width: 80px;
height: 80px;
background-color: green;
padding: .5em;
will-change: transform;
}
.dashed {
border-style: dashed;
}
.transparent {
border-color: rgba(255,0,0,0.5);
}
</style>
<div class = "outer">
<div class = "inner"></div>
</div>
<div class = "outer dashed">
<div class = "inner"></div>
</div>
<div class = "outer transparent">
<div class = "inner"></div>
</div>