wp-buttons.html

<span class="button" style="vertical-align:baseline;background:white;border-color:#c8d7e1;border-style:solid;border-width:1px 1px 2px;color:#2e4453;cursor:pointer;display:inline-block;margin:0;outline:0;overflow:hidden;font-weight:500;text-overflow:ellipsis;text-decoration:none;box-sizing:border-box;font-size:14px;line-height:21px;border-radius:4px;padding:7px 14px 9px;-webkit-appearance:none;-moz-appearance:none;appearance:none;">Button</span>

<span class="button is-primary" style="background: #00aadc;border-color: #008ab3;color: #fff;border-style: solid;border-width: 1px 1px 2px;cursor: pointer;display: inline-block;margin: 0;outline: 0;overflow: hidden;font-weight: 500;text-overflow: ellipsis;text-decoration: none;vertical-align: top;box-sizing: border-box;font-size: 14px;line-height: 21px;border-radius: 4px;padding: 7px 14px 9px;-webkit-appearance: none;-moz-appearance: none;appearance: none;">Primary</span>

<span class="button is-scary" style="padding: 7px 14px 9px;vertical-align: baseline;color: #d94f4f;background: #fff;border-color: #c8d7e1;border-style: solid;border-width: 1px 1px 2px;cursor: pointer;display: inline-block;margin: 0;outline: 0;overflow: hidden;font-weight: 500;text-overflow: ellipsis;text-decoration: none;vertical-align: top;box-sizing: border-box;font-size: 14px;line-height: 21px;border-radius: 4px;-webkit-appearance: none;-moz-appearance: none;appearance: none;">Scary</span>

<span class="button is-compact" style="vertical-align: baseline;padding: 7px;color: #537994;font-size: 12px;line-height: 1;background: #fff;border-color: #c8d7e1;border-style: solid;border-width: 1px 1px 2px;cursor: pointer;display: inline-block;margin: 0;outline: 0;overflow: hidden;font-weight: 500;text-overflow: ellipsis;text-decoration: none;vertical-align: top;box-sizing: border-box;line-height: 21px;border-radius: 4px;padding: 7px 14px 9px;-webkit-appearance: none;-moz-appearance: none;appearance: none;">Compact</span>