How to change the text color

HTML:

<p>This a <span class="crimson-text">crimson text</span> within others.</p>

CSS

.crimson-text {
      color: crimson;
   }

 

How to change background color

<p>
      A <span class="green-background">green background color</span> perfectly
      implies the beauty of nature.
</p>

 .green-background {
        background-color: #2ecc71;
      }

How to change font style

<p>
   An <span class="font-style">italic</span> font style could be instrumental
   in laying emphasis on a text.
</p>

.font-style {
     font-style: italic;
   }