How to change the background color of quote blocks?

The background color of the quotes is very dark gray. I would like to change the color (and also the color of the text). I tried adding this to the css (I found it somewhere online and copied and pasted it)

blockquote {
max-width: 550px;
text-align: center;
margin: 20px;
padding: 20px;
font-size: 30px;
color: #edb2b2;
background: #ccc;

But for some reason the colors do not change. The dark gray background looks super ugly. Could anybody please help me?

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