Diferença BW Box and Border Box
.alligator-box {
box-sizing: border-box;
width: 125px;
height: 125px;
border-width: 10px;
padding: 40px;
}
Tense Tuatara
.alligator-box {
box-sizing: border-box;
width: 125px;
height: 125px;
border-width: 10px;
padding: 40px;
}.alligator-box {
box-sizing: content-box;
width: 125px;
height: 125px;
border-width: 10px;
padding: 40px;
}