Deep ocean

Deep ocean: a CSS button. Copy the rules, or the prompt that rebuilds it.

CSS

.btn-028 {
  font: 600 15px/1 system-ui,sans-serif;
  color: #e0f2fe;
  background: linear-gradient(180deg,#0c4a6e,#082f49);
  border: 1px solid #0e7490;
  border-radius: 8px;
  padding: 12px 24px;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.15);
  transition: background .2s,border-color .2s
}
.btn-028:hover {
  background: linear-gradient(180deg,#155e75,#0c4a6e);
  border-color: #22d3ee
}
.btn-028:focus-visible {
  outline: 2px solid #22d3ee;
  outline-offset: 2px
}
.btn-028:active {
  background: #082f49
}

HTML

<button class="btn-028">Dive in</button>

Prompt

A dark vertical gradient button from #0c4a6e at top to #082f49 at bottom, 1px #0e7490 border, a 1px inner white highlight at the top (15%), pale blue text #e0f2fe at 15px semibold, 8px radius, 12px by 24px padding. Hover lightens the gradient (#155e75 to #0c4a6e) and the border to cyan #22d3ee. Active flat #082f49. Focus outline 2px cyan.

Deep ocean

Same shelf