lightdm-webkit2-greeter/web-greeter/themes/style.css

html {
  color: #ebdbb2;
  background-color: #282828;
  font-family: system-ui;

  min-height:100%;
  position:relative;
}
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
}

#background {
  height: 100%;
  width: 100%;
  position: absolute;

  background-color: var(--bg);
  background-image: url("./themes/gruvbox/assets/death star.svg")
}

#screen {
  position: relative;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  z-index: 1;
}
#wrapper {
  width: 45em;
  max-width: 60vw;
  min-height: 18em;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;

  background-color: #32302f;
  margin: 15px;
  border-radius: 5px;

  filter: drop-shadow(2px 6px 10px rgba(0,0,0,0.8));
}
#wrapper > h2 {
  font-weight: bold;
  font-size: 1.8em;
  text-align: center;
}

#wrapper-themes {
  width: -webkit-fill-available;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  padding: 1em 0em 2em 0em;
}

a {
  color: #ebdbb2;
  text-decoration: none;
}

.theme-div {
  display: flex;
  width: fit-content;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 8px;
  margin: 5px;

  border-radius: 5px;
  background-color: #665c54;

  transition: 300ms;
}
.theme-div img{
  width: 16em;
  max-width: 30vw;
  height: fit-content;
  border-radius: 5px;
  margin: 5px;
}

.theme-div:hover, .theme-div:focus {
  background-color: #83a598;
}

button {
  background-color: transparent;
  border: 0;
  font-size: inherit;
  cursor: pointer;
}

span {
  color: #ebdbb2;
  font-weight: bold;
}

.floating {
  position: fixed;
}
.floating.right {
  right: 0;
}
.floating.bottom {
  bottom: 0;
}
.floating.left {
  left: 0;
}
.floating.top {
  top: 0;
}

#floating-buttons {
  display: flex;
  flex-direction: row;
  margin: 1.2em;
}
.social {
  display: inline-block;
  border-radius: 100%;
  backdrop-filter: blur(5px);
  background-color: #50494500;
  transition: 300ms;
  padding: 5px;
  margin: 5px;
}
.social:hover, .social:focus {
  background-color: #504945;
}

.tooltip {
  position: relative;
  display: inline-flex;
  justify-content: center;
}

.tooltip .tooltiptext {
  visibility: hidden;
  width: 90px;
  background-color: #504945;
  color: #ebdbb2;
  text-align: center;
  padding: 5px;
  border-radius: 5px;

  position: absolute;
  z-index: 1;
  bottom: 110%;

  opacity: 0;
  transition: opacity 300ms;
}
.tooltiptext {
  font-size: 12px;
}

.tooltip:hover .tooltiptext, .tooltip:focus .tooltiptext, .tooltip:focus-within .tooltiptext {
  opacity: 1;
  visibility: visible;
}