styles.css

:root {
  --overlay-color: "black";
  --overlay-opacity: 85%;
  --spotlight-width: 5em;
  --spotlight-height: var(--spotlight-width);
  --spotlight-soft-edge: 80%;
  --mouse-x: 80%;
  --mouse-y: 15%;
  --background-color: #050001;
  --blue: #b2cddc;
}
body {
  font-family: "Montserrat", sans-serif;
  text-align: center;
  background-color: var(--blue);
}
main {
  background-color: white;
  max-width: 24vw;
  display: block;
  margin: 0 auto;
  padding-bottom: 1.5em;
}
h1 {
  font-weight: normal;
}

p {
  font-size: 1em;
  letter-spacing: 0.05em;
}

.container {
  max-width: 24vw;
  margin: 0 auto;
}

.content {
  position: relative;
  z-index: 1;
}
img {
  max-width: 100%;
  max-height: 100%;
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  background-color: var(--background-color);
  opacity: var(--overlay-opacity);
  cursor: pointer;
  mask: radial-gradient(
    var(--mouse-x) var(--mouse-y),
    var(--spotlight-width) var(--spotlight-height),
    transparent 0,
    black
  );
  -webkit-mask: -webkit-radial-gradient(
    var(--mouse-x) var(--mouse-y),
    var(--spotlight-width) var(--spotlight-height),
    transparent var(--spotlight-soft-edge),
    black
  );
}

button {
  border: none;
  outline: none;
}
button a {
  text-decoration: none;
  color: inherit;
}
.instructions {
  display: none;
}
.button-container {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  background-color: white;
  width: 5.5em;
  height: 2.2em;
  margin: 0 auto;
  margin-top: 1.5em;
  box-shadow: 0 0 0 1px black;
  border-radius: 2em;
}

.on {
  border: none;
  outline: none;
  cursor: pointer;
  background: transparent;
  border-radius: 50%;
  transition: margin-left 0.5s;
}
.cta {
  font-weight: bold;
  line-height: 2em;
  padding: 1em 3em;
  background-color: white;
  box-shadow: 0 0 0 1px black;
  margin-top: 1.5em;
  letter-spacing: 0.05em;
}

footer svg {
  transition: color 0.5s ease-in-out;
}
footer svg.lucide {
  color: var(--background-color);
  margin-top: 4em;
  margin-bottom: 1em;
  margin-left: 1em;
  width: 40px;
  height: 40px;
  stroke-width: 1.5px;
}
footer svg.lucide:hover {
  color: white;
}
footer a {
  text-decoration: none;
}