* {
margin: 0; padding: 0;
}
.a {
/* height: 100px; */
border: 1px solid red;
overflow: hidden;
}
.b {
width: 100px; height: 100px;
background-color: red;
float: left;
}
.c {
width: 100px; height: 100px;
background-color: green;
float: left;
}
/* .a:after {
content: "";
display: block;
clear: both;
} */
