How do I replace Squarespace's buttons with my own custom css buttons?

I'm trying to replace the default buttons on my template (Sonny) with some custom CSS buttons I have made. I know I can insert them using a code block, but ideally I'd like to be able to insert them using the regular button block, replacing the default ones provided by the template. I have tried targeting the squarespace buttons, however the old button remains and simply gets outlined by my new button.

This is the CSS I current have in my Custom CSS:

 .sqs-block-button {
     border-top: 2px solid #30d2ff;
       background-image: 
           linear-gradient(#30d2ff, blue),
           linear-gradient(#30d2ff, blue);
       background-size:2px 100%;
       background-position:0 0, 100% 0;
       background-repeat:no-repeat;
       border-bottom: 2px solid blue;
       border-radius: 3px;
       color: black;
       background-color: white; 
       display: inline-block;
   }

Am I targeting the wrong element or is what I'm asking impossible?

Thanks in advance.

It should be possible but you haven't provided a link to your site (something.squarespace.com).

The example above was the following CSS applied to your medium button on your example site. To set medium buttons to look like this, I amended your CSS as follows:

.medium-button-style-outline .sqs-block-button .sqs-block-button-element--medium {
 background-image: linear-gradient(#30d2ff, blue), linear-gradient(#30d2ff, blue);
 background-size:2px 100%;
 background-position:0 0, 100% 0;
 background-repeat:no-repeat;
 border-top: 2px solid #30d2ff;
 border-bottom: 2px solid blue;
 border-radius: 3px;
 color: grey;
 display: inline-block;
 border-width: 2px;
 border-left: 0;
 border-right:0;
 border-style: transparent;
}

.medium-button-style-outline .sqs-block-button .sqs-block-button-element--medium:hover{
 background-color: transparent; /* or other hover color */
 color: black;
}

I hope that helps.

Paul

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That worked wonderfully, thank you so much!