html - How do you use one class for multiple tags? -

i want use 1 class 2 different tags. have declare <h1 class="line"> , <p class="line"> ??? , in css .line , change both then? please help. thanks

you need declare class within css:

.line {     background-color: red; } 

and can apply class html elements:

<tag1 class="line" /> <tag2 class="line" />