::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #ff4d4d;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #eb0000;
}

html {
  scrollbar-width: thin;
  scrollbar-color: #ff4d4d transparent;
}

body {
  background: #8b0000;
  color: white;
  font-size: 30px;
  text-align: center;
  font-family: "Poppins", sans-serif;
}
body #container {
  display: flex;
  height: 100vh;
  justify-content: center;
  align-items: center;
}
body #container .main-title {
  font-size: 50px;
  margin-bottom: 20px;
  font-weight: 600;
}
body #container .length-control {
  width: 260px;
}
body #container button {
  background: none;
  outline: none;
  border: none;
  color: white;
  cursor: pointer;
  transition: color 0.3s ease;
}
body #container button:hover {
  color: #ffb3b3;
}
body #container .btn-level,
body #container .length-control {
  display: inline-block;
}
body #container .btn-level .btn-level:nth-child(3),
body #container .length-control .btn-level:nth-child(3) {
  width: 40px;
}
body #container .timer {
  border: 5px solid #4b0000;
  margin: 20px auto 10px auto;
  width: 270px;
  height: 160px;
  border-radius: 20px;
  position: relative;
}
body #container .timer .timer-wrapper {
  position: absolute;
  width: 190px;
  height: 110px;
  left: 50%;
  top: 50%;
  margin-left: -95px;
  margin-top: -57px;
  font-size: 20px;
}
body #container .timer #time-left {
  font-family: "Poppins", sans-serif;
  font-size: 60px;
  font-weight: 500;
}
body #container .timer .timer-control button:active {
  color: #4b0000;
}

@media screen and (max-width: 500px) {
  #container {
    transform: scale(0.8);
    -webkit-transform: scale(0.8);
    -moz-transform: scale(0.8);
    -ms-transform: scale(0.8);
    -o-transform: scale(0.8);
  }
}
.author {
  text-align: center;
  font-family: "Poppins", sans-serif;
  margin-top: 15px;
  font-size: 14px;
  color: #ff6b6b;
}
.author a {
  text-decoration: none;
  color: #ffb3b3;
  line-height: 26px;
}