Qoida tariqasida, oldingi darslarda tasvirlangan kengayish zararli va siz undan qutulishni xohlaysiz. Shu maqsadda CSS-da box-sizing xususiyati mavjud. Agar siz unga border-box qiymatini bersangiz, u holda padding ham, border ham blokni kengaytirmaydi:
<div id="elem1"></div>
<div id="elem2"></div>
#elem1 {
width: 100px;
height: 100px;
background: #f1f1f1;
margin-bottom: 20px;
}
#elem2 {
width: 100px;
height: 100px;
background: #f1f1f1;
padding: 25px; /* padding beramiz */
border: 10px solid green; /* border beramiz */
box-sizing: border-box; /* kengayishni o'chiramiz */
}