html - element not selecting class -


i can't understand wrong. me bit? trying customize button, won't select class.

<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">   <input type="hidden" name="cmd" value="_s-xclick">   <input type="hidden" name="hosted_button_id" value="gaeupe4gxm68e">   <input type="submit" value="instant buy" name="submit" title="paypal – safer, easier way pay online." class="paypal-btn">   <img alt="" border="0" src="https://www.paypalobjects.com/en_gb/i/scr/pixel.gif" width="1" height="1"> </form>   .paypal_btn {   display: inline-block;   font-family: inherit;   font-size: 14px;   font-weight: bold;   color: #fff;   text-align: center;   padding: 10px 14px;   margin: 0;background: #ff6600;   border: 0;   cursor: pointer;   outline: none; }

the class "paypal-btn" (separated dash) , in css put ".paypal_btn" (separated underscore)


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