Ghost glow edge
Ghost glow edge: a CSS button. Copy the rules, or the prompt that rebuilds it.
CSS
.btn-110 {
font: 500 14px/1 system-ui,sans-serif;
color: #4f46e5;
background: #fff;
border: 1px solid #c7d2fe;
border-radius: 8px;
padding: 12px 22px;
cursor: pointer;
box-shadow: 0 0 0 0 #6366f100;
transition: box-shadow .3s,border-color .3s,background .3s
}
.btn-110:hover {
border-color: #6366f1;
box-shadow: 0 0 0 4px #6366f122,0 0 18px #6366f166
}
.btn-110:focus-visible {
outline: 2px solid transparent;
border-color: #4f46e5;
box-shadow: 0 0 0 4px #6366f155
}
.btn-110:active {
background: #eef2ff;
box-shadow: 0 0 0 2px #6366f133
}
HTML
<button class="btn-110">Preview</button>Prompt
A quiet white button with a 1px lavender #c7d2fe border, 8px radius, indigo #4f46e5 14px medium text, 12px by 22px padding. On hover the border turns #6366f1 and an indigo glow appears: a 4px translucent ring plus an 18px soft halo, fading in over 300ms. Focus uses the same ring at higher opacity instead of an outline; active tints the background #eef2ff.