CSS Add border on your Element

**Could anyone please help me on my CSS Add border on element activity?

The only problem is that the border turns to blue instead of green eventhough its already green on its color

.smaller-image { width:100px; .thin-green-border Border-color: green; Border-width: 10px; Border-style; solid; }

Hi, it looks like you are writing your css styles incorrectly. Should be:
.smaller-image { width: 100px; border-width: 10px; border-style: solid; }
.thin-green-border { border-color: green; }