class overrule when two classes assigned to one div

Answer 1

Actually, the class that defined last in the css - is applied on your div.

check it out:

red last in css

.blue{ color: blue; }
.red { color: red;  }

blue red
red blue

vs

blue last in css

.red { color: red;  }
.blue{ color: blue; }

blue red
red blue