.quantity-in-physics{width:130px; height:201px ;}
.quantity-example{width:130px; height:191px ;}
.type-of-quantity{width:130px; height:101px ;}
.which-direction{width:120px; height:62px ;}
.common-mistake{width:130px; height:275px ;}
.adding-quantities{width:px; height:px ;}