style.css

body {
  margin: 0;
  background: linear-gradient(to left, lightblue, lightgreen);
  font-family: "Courier New", Courier, monospace;
}

.heading {
  color: darkblue;
  text-align: center;
  padding-top: 10px;
  font-size: 35px;
}

.info-text {
  text-align: center;
  color: darkblue;
  font-size: 18px;
}

.app {
  display: grid;
  grid-template-columns: repeat(auto-fill, 300px);
  gap: 40px;
  justify-content: center;
  padding: 50px;
}

.note {
  padding: 17px;
  border-radius: 15px;
  resize: none;
  box-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
  font-size: 18px;
  height: 200px;
  color: darkblue;
  border: none;
  outline: none;
  background-color: rgba(255, 255, 255, 0.2);
  box-sizing: border-box;
}

.note::placeholder {
  color: grey;
  opacity: 30%;
}

.note:hover,
.note:focus {
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  transition: all 300ms ease;
}

.btn {
  height: 200px;
  border-color: rgba(255, 255, 255, 0.37);
  background: rgba(255, 255, 255, 0.27);
  border-radius: 15px;
  font-size: 70px;
  font-weight: 700;
  color: rgba(0, 0, 0, 0.3);
  cursor: pointer;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.55);
  color: rgba(0, 0, 0, 0.6);
  transition: all 300ms ease;
}

/* width */
::-webkit-scrollbar {
  width: 5px;
  border-radius: 25px;
}

/* Track */
::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 25px;
}

/* Handle */
::-webkit-scrollbar-thumb {
  background: #888;
  border-radius: 25px;
}

/* Handle on hover */
::-webkit-scrollbar-thumb:hover {
  background: #555;
  border-radius: 25px;
}