index.css

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: white;
  background-color: #2c3e50;
  font-size: 30px;
}

.header {
  width: 200px;
  height: 200px;
}
.forms > input {
  border: none;
  padding: 15px 0px;
  width: 100%;
  display: flex;
  font-size: 30px;
  border-bottom: 1px solid rgb(0, 0, 0.4);
  justify-content: center;
}
.js-toDoForm > input:focus {
  outline: none;
}
.js-toDoForm > input::placeholder {
  color: rgba(0, 0, 0, 0.4);
}
.clicked {
  color: #7f8c8d;
}
.form,
.greetings {
  display: none;
}
.showing {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
.bgImage {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  animation: fadeIn 0.5s linear;
}
.js-form > input {
  font-size: 50px;
}