Css img border not going through

this is what I have and it doesn’t pass though., am I missing something?

thick-green-border { border-color: green; border-width: 10px; border-style: solid; }
<img class= "smaller-image thick-green-border" src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>

Class selectors should have a dot . in front.

.thick-green-border {

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