box sizing Css Mosh

content box

div {
box-sizing: content-box;
width: 100%;
border: solid #5B6DCD 10px;
padding: 5px;
}

border box

div {
box-sizing: border-box;
width: 100%;
border: solid #5B6DCD 10px;
padding: 5px;
}

we should use these codes for ::before ::after