Buy me a coffee 
<style>
.sqs-block-button-element--small.sqs-button-element--tertiary.sqs-block-button-element {
  background-color: transparent !important;
  color: var(--tertiaryButtonBackgroundColor) !important;
  border: none !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  position: relative;
  transition: color 0.3s ease, background 0s !important;
  background: 
    radial-gradient(circle at 0 0, transparent 13px, var(--tertiaryButtonBackgroundColor) 13px, var(--tertiaryButtonBackgroundColor) 15px, transparent 15px),
    radial-gradient(circle at 100% 0, transparent 13px, var(--tertiaryButtonBackgroundColor) 13px, var(--tertiaryButtonBackgroundColor) 15px, transparent 15px),
    radial-gradient(circle at 0 100%, transparent 13px, var(--tertiaryButtonBackgroundColor) 13px, var(--tertiaryButtonBackgroundColor) 15px, transparent 15px),
    radial-gradient(circle at 100% 100%, transparent 13px, var(--tertiaryButtonBackgroundColor) 13px, var(--tertiaryButtonBackgroundColor) 15px, transparent 15px),
    linear-gradient(to right, var(--tertiaryButtonBackgroundColor) 2px, transparent 2px) 0 15px / 2px calc(100% - 30px) no-repeat,
    linear-gradient(to left, var(--tertiaryButtonBackgroundColor) 2px, transparent 2px) 100% 15px / 2px calc(100% - 30px) no-repeat,
    linear-gradient(to bottom, var(--tertiaryButtonBackgroundColor) 2px, transparent 2px) 15px 0 / calc(100% - 28px) 2px no-repeat,
    linear-gradient(to top, var(--tertiaryButtonBackgroundColor) 2px, transparent 2px) 15px 100% / calc(100% - 28px) 2px no-repeat !important;
}

.sqs-block-button-element--small.sqs-button-element--tertiary.sqs-block-button-element:hover {
  color: #fff !important;
  background-color: var(--tertiaryButtonBackgroundColor) !important;
  -webkit-mask-image: radial-gradient(circle at 15px 15px, transparent 15px, black 15px);
  -webkit-mask-position: -15px -15px, calc(100% + 15px) -15px, -15px calc(100% + 15px), calc(100% + 15px) calc(100% + 15px);
  -webkit-mask-size: 100% 100%;
  background: 
    radial-gradient(circle at 0 0, transparent 15px, var(--tertiaryButtonBackgroundColor) 15px),
    radial-gradient(circle at 100% 0, transparent 15px, var(--tertiaryButtonBackgroundColor) 15px),
    radial-gradient(circle at 0 100%, transparent 15px, var(--tertiaryButtonBackgroundColor) 15px),
    radial-gradient(circle at 100% 100%, transparent 15px, var(--tertiaryButtonBackgroundColor) 15px),
    linear-gradient(var(--tertiaryButtonBackgroundColor), var(--tertiaryButtonBackgroundColor)) center / calc(100% - 30px) 100% no-repeat,
    linear-gradient(var(--tertiaryButtonBackgroundColor), var(--tertiaryButtonBackgroundColor)) center / 100% calc(100% - 30px) no-repeat !important;
}
</style>