style.css

body {
  background-color: rgb(0, 43, 54);
  padding: 15px 50px;
  position: relative;
}

h1, h2, h3, h4, p, input, textarea, button, code, a.button, label {
  font-family: Consolas, monospace;
  color: rgb(253, 246, 227);
}

h1 {
  font-size: 15px;
}

textarea, button, a.button {
  font-size: 20px;
  background-color: rgb(0, 43, 54);
  border: 1px solid rgb(253, 246, 227);
  padding: 5px 10px;
  box-sizing: border-box;
}

a.button {
  display: inline-block;
  text-decoration: none;
}

button:hover, a.button:hover {
  color: rgb(238, 232, 213);
  border-color: rgb(238, 232, 213);
}

a.button:active, a.button:focus, button:active, button:focus {
  color: rgb(147, 161, 161);
  border-color: rgb(147, 161, 161);
  outline: none;
}

code {
  font-size: 40px;
}

textarea {
  width: 100%;
  min-height: 100px;
  overflow-x: scroll;
}

label, input {
  display: block;
  width: 100%;
}
input[type="range"] {
  margin-bottom: 15px;
}


.overlay {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 43, 54, 0.5);
  backdrop-filter: blur(5px);
}

.overlay button {
  display: block;
  font-size: 2rem;
  margin: 5rem auto;
}