style.css

* {
  font-size: 40px;
}

body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: url('https://media.istockphoto.com/id/523382283/vector/simple-stars-space-stock-vector-background.jpg?s=612x612&w=0&k=20&c=PE-1LqWTOaxMuu_0TkUohHQWAF8TVxFSm-lfyCWdbO4=');
}

.background {
  width: 430px;
  height: 520px;
  position: absolute;
  transform: translate(-50%, -50%);
  left: 50%;
  top: 50%;
}

.background .shape {
  height: 200px;
  width: 200px;
  position: absolute;
  border-radius: 50%;
}

.shape:first-child {
  background: linear-gradient(#1845ad, #23a2f6);
  left: -170px;
  top: -70px;
}

.shape:last-child {
  background: linear-gradient(to right, #ff512f, #f09819);
  right: -170px;
  bottom: -70px;
}

h1 {
  font-size: 34px;
  text-align: center;
  text-decoration: underline;
}

.box {
  background: rgba(255, 255, 255, 0.13);
  border-radius: 20px;
  padding: 10px 25px;
  backdrop-filter: blur(10px);
  border: 2px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 0 40px rgba(8, 7, 16, 0.6);
  color: #ffffff;
}

label {
  margin-top: 30px;
  font-size: 22px;
  font-weight: 500;
}

input {
  width: 60%;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.07);
  outline: none;
  border: none;
  padding: 0px 10px;
  position: relative;
  top: 3px;
  color: #fff;
  font-size: 24px;
  margin-bottom: 10px;
}

::placeholder {
  color: #d3d1d1;
  position: absolute;
  top: 7px;
}

input:focus {
  outline: none;
  border: none;
}

i {
  font-size: 24px;
}

#view,
#unit {
  text-align: center;
  border-radius: 10px;
  width: 34%;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.07);
  outline: none;
  border: none;
  padding: 0px 10px;
  position: relative;
  top: 5px;
  color: #e5e5e5;
  font-size: 24px;
}

select option {
  color: #e5e5e5;
  font-size: 24px;
  background-color: #333;
  border: none;
  outline: none;
}

#time,
#color {
  border-radius: 10px;
}

#submit {
  background-color: green;
  cursor: pointer;
  border-radius: 10px;
  transition: 0.2s all;
}

#submit:hover {
  background-color: darkgreen;
}

#reset {
  border-radius: 10px;
  background-color: red;
  cursor: pointer;
  transition: 0.2s all;
}

#reset:hover {
  background-color: rgb(169, 2, 2);
}

.button {
  margin-top: 40px;
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
}

button {
  font-size: 20px;
  padding: 10px 20px;
  color: #fff;
}

.screen {
  display: flex;
  justify-content: center;
  align-items: center;
}

#error {
  display: flex;
  align-items: center;
  justify-content: center;
}

#error strong {
  font-size: 22px;
}

.connect {
  margin-top: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 50px;
  font-weight: 700;
}

img {
  cursor: pointer;
  box-shadow: 0px 0px 5px 5px black;
  border-radius: 5px;
  margin-top: 5px;
  height: 50px;
  width: 50px;
}

img:hover {
  transform: scale(1.1);
}

@media only screen and (max-width: 1048px) {
  * {
    font-size: 35px;
  }

  .button {
    margin-top: 30px;
    margin-bottom: 12px;
  }

  img {
    width: 45px;
    height: 45px;
  }
}

@media only screen and (max-width: 924px) {
  * {
    font-size: 30px;
  }
}

@media only screen and (max-width: 800px) {
  * {
    font-size: 25px;
  }

  .button {
    margin-top: 20px;
    margin-bottom: 8px;
  }

  img {
    width: 35px;
    height: 35px;
    box-shadow: 0px 0px 3px 3px black;
  }

  .box {
    padding: 0px 5px 5px 5px;
    box-shadow: 0px 0px 10px 5px black;
  }
}

@media only screen and (max-width: 676px) {
  * {
    font-size: 20px;
  }
}

@media only screen and (max-width: 552px) {
  * {
    font-size: 15px;
  }

  .button {
    margin-top: 10px;
    margin-bottom: 4px;
  }

  img {
    width: 25px;
    height: 25px;
  }
}

@media only screen and (max-width: 428px) {
    * {
        font-size: 10px;
    }
}


#timerDisplay {
    position: fixed;
    top: 10px;
    right: 10px;
    font-size: 2em;
    font-weight: bold;
    color: white;
    background: rgba(0, 0, 0, 0.5);
    padding: 10px;
    border-radius: 5px;
}

#message {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgb(113, 230, 245);
    padding: 20px;
    border: 1px solid black;
    z-index: 1000;
    font-size: 18px;
    text-align: center;
}
/* Additional CSS for the brightness feature */
input[type="range"] {
  width: 60%;
  -webkit-appearance: none;
  appearance: none;
  background: linear-gradient(to right, #f6f6f6, #f6f6f6);
  border-radius: 10px;
  height: 5px;
  outline: none;
  margin-top: 5px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: #4caf50;
  border-radius: 50%;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: #4caf50;
  border-radius: 50%;
  cursor: pointer;
}