:root {
  --bg-color: #fff;
  --font-coloe: #000;
  --primary: #f55e55;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #161616;
    --font-coloe: #fff;
  }
}

* {
  margin: 0;
  padding: 0;
  user-select: none;
  box-sizing: border-box;
  -webkit-user-drag: none;
}

body {
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-color);
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
}

footer {
  position: absolute;
  bottom: 20px;
  font-size: 14px;
  color: var(--primary);
  opacity: 0.6;
}

.logo {
  width: 120px;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.loader,
.loader:before,
.loader:after {
  border-radius: 50%;
  width: 2.5em;
  height: 2.5em;
  animation-fill-mode: both;
  animation: bblFadInOut 1.8s infinite ease-in-out;
}

.loader {
  color: var(--primary);
  font-size: 6px;
  position: relative;
  text-indent: -9999em;
  transform: translateZ(0);
  animation-delay: -0.16s;
  margin: 40px 0;
}

.loader:before,
.loader:after {
  content: "";
  position: absolute;
  top: 0;
}

.loader:before {
  left: -3.5em;
  animation-delay: -0.32s;
}

.loader:after {
  left: 3.5em;
}

#startApp {
  opacity: 0;
  margin-top: 10px;
  outline: none;
  border: 2px solid var(--primary);
  height: 36px;
  width: 90px;
  font-size: 14px;
  border-radius: 12px;
  color: var(--primary);
  font-weight: bold;
  background-color: transparent;
  cursor: pointer;
  transition: opacity 0.3s;
}

@keyframes bblFadInOut {
  0%,
  80%,
  100% {
    box-shadow: 0 2.5em 0 -1.3em;
  }

  40% {
    box-shadow: 0 2.5em 0 0;
  }
}