style.css

body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: #ecf0f1;
  margin: 10;
  padding: 0;
}

.loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  z-index: 100;
  align-items: center;
  justify-content: center;
  background: #333333;
   transition: opacity 3s, visibility 0.75s;
}

.loader--hidden {
  opacity: 0;
  visibility: hidden;
}

.loader::after {
  content: "";
  width: 75px;
  height: 75px;
  border: 15px solid #dddddd;
  border-top-color: #0e64e5;
  border-radius: 50%;
  animation: loading 3s ease infinite;
}

@keyframes loading {
  from {
    transform: rotate(0turn);
  }
  to {
    transform: rotate(1turn);
  }
}


.all {
  text-align: center;
  margin-top: 100px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #f8f8f8;
  border-radius: 20px;
  box-shadow: 0 0 10px rgba(105, 138, 187, 0.781);
  transition: box-shadow 0.3s ease;
}

header:hover {
  box-shadow: 0 0 20px rgba(105, 138, 187, 0.781);
}

.logo {
  padding-left: 10px;
  display: flex;
  align-items: center;
}

.logo a {
  text-decoration: none;
  color: #333;
}

.logo img {
  margin-right: 10px;
}

.logo a:hover {
  text-decoration: underline;
}

.right {
  display: flex;
  align-items: center;
}

.right a {
  text-decoration: none;
  padding-right: 10px;
  color: #333;
}

.right a:hover {
  text-decoration: underline;
}

h1 {
  line-height: 0px;
  font-size: 40px;
  color: #1e272e;
}

p {
  color: #666;
}

.input {
  padding: 10px;
  margin-top: 20px;
  width: 50%;
  border: 1px solid #ccc;
  border-radius: 5px;

}

.input:hover {
  border-color: #007bff;
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.input:focus {
  border-color: #5f9ff9;
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

button {
  display: inline-block;
  border-radius: 4px;
  background-color: #4a69bd;
  border: none;
  color: #FFFFFF;
  text-align: center;
  font-size: 13px;
  padding: 16px;
  width: 30;
  transition: all 0.5s;
  cursor: pointer;
  margin: 5px;
}

button span {
  cursor: pointer;
  display: inline-block;
  position: relative;
  transition: 0.5s;
}

button span:after {
  content: '»';
  position: absolute;
  opacity: 0;
  top: 0;
  right: -15px;
  transition: 0.5s;
}

button:hover span {
  padding-right: 15px;
}

button:hover span:after {
  opacity: 1;
  right: 0;
}

.msg {
  font-size: 25px;
  margin-top: 20px;
  padding-left: 50px;
  text-align: left;
  color: black;
}
.output {
  margin-top: 2px;
  padding: 10px;
  padding-left: 50px;
  
  border: 1px solid #c0c0c0;
  border-radius: 5px;
  text-align: left;
  color: black;
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: #1c1f23;
  }

  header {
    background-color: #424242;
  }

  .right a {
    color: #e9e5e5;
  }

  .right img {
    filter: invert(1);
  }

  h1 {
    color: #e9e5e5;
  }

  p {
    color: #d4cccc;
  }
  .msg {
    color: rgb(225, 214, 214);
  }
  .output {
    border: 1px solid #2b2b2b;
    color: rgb(225, 214, 214);
  }

  .input {
    background: #2a2b33;
    color: #b6b6b7;
  }
}