styles.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: black;
  color: white;
  font-family: 'Fredoka One', cursive;
  min-height: 100vh;
}

header {
  font-size: 1.5rem;
  text-transform: uppercase;
}

header, form {
  min-height: 20vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

form input, form button {
  padding: 0.5rem;
  font-size: 2rem;
  border: none;
  background: white;
}

form button {
  background: white;
  color: #49cc49;
  cursor: pointer;
  padding: 0.5rem 1rem;
  transition: all 0.3s ease;
}

form button:hover {
  color: white;
  background: #49cc49;
}

.todo-container {
  display: flex;
  font-family: 'Ubuntu', sans-serif;
  justify-content: center;
  align-items: center;
}

.todo-list {
  min-width: 30%;
  list-style: none;
}

.todo {
  margin: 0.5rem;
  background: white;
  color: black;
  font-size: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.5s ease;
}

.todo li{
  padding: 0rem 0.5rem;
  flex: 1;
}

.trash-button, .complete-button {
  background: red;
  color: white;
  border: none;
  padding: 1rem;
  cursor: pointer;
  font-size: 1rem;
}

.complete-button{
  background: #49cc49;
}

.complete-button:hover{
  background: grey;
  color: #49cc49;
}

.trash-button:hover{
  background: grey;
  color: red;
}

.fa-trash, .fa-check{
  pointer-events: none;
}

.completed {
  text-decoration: line-through;
  opacity: 0.5;
}

.fall {
  transform: translateY(8rem) rotateZ(20deg);
  opacity: 0;
}

select {
  -webkit-appearance: none;
  -moz-appearance: none;
  outline: none;
  border: none;
}

.select {
  margin: 1rem;
  position: relative;
  overflow: hidden;
}

select {
  color: black;
  width: 10rem;
  padding: 1rem;
  cursor: pointer;
}

.select:after {
  content: "\25BC";
  position: absolute;
  background: #49cc49;
  top: 0;
  right: 0;
  padding: 1rem;
  pointer-events: none;
  transition: all 0.3s ease;
}

.select:hover::after {
  color: #49cc49;
  background: white;

}

form button, .trash-button, .complete-button {
   outline:none;
}

form button::-moz-focus-inner, .trash-button::-moz-focus-inner, .complete-button::-moz-focus-inner {
   border: 0;
}

select:-moz-focusring {
    color: transparent;
    text-shadow: 0 0 0 #000;
}