style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background: linear-gradient(
    98deg,
    rgba(34, 193, 195, 1) 0%,
    rgba(253, 187, 45, 1) 100%
  );
  color: #fff;
  font-family: "Montserrat", sans-serif;
  min-height: 100vh;
}

header {
  font-size: 1.5rem;
}
header,
form {
  min-height: 20vh;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}
form input,
form button {
  padding: 0.5rem;
  font-size: 2rem;
  border: none;
  background-color: #fff;
}
form button {
  color: rgba(253, 187, 45, 1);
  cursor: pointer;
  transition: all 0.3s ease;
}
form button:hover {
  background-color: rgba(253, 187, 45, 1);
  color: #fff;
}

/*Todo list Elements Style*/
.todo-container {
  display: flex;
  justify-content: center;
  align-items: center;
}
.todo-list {
  min-width: 30%;
  list-style: none;
}
.todo {
  margin: 0.5rem auto;
  background-color: #fff;
  color: #000;
  font-size: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.4s ease;
}
.todo li {
  flex: 1;
}
.trash-btn,
.complete-btn {
  background-color: rgba(253, 187, 45, 1);
  color: #fff;
  border: none;
  padding: 1rem;
  cursor: pointer;
  font-size: 1rem;
}
.complete-btn {
  background-color: rgb(34, 195, 120);
}
.todo-item {
  padding: 0rem 0.5rem;
}
.fa-trash,
.fa-check {
  pointer-events: none;
}

/*completed toggle effect*/
.completed {
  opacity: 0.5;
  text-decoration: line-through;
}
.fall {
  transform: translateY(8rem) rotateZ(20deg);
  opacity: 0;
}

/*Tasks Filter Style*/
select {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  outline: none;
  border: none;
  color: rgb(253, 187, 45);
  width: 10rem;
  cursor: pointer;
  padding: 1.16rem;
}
.select {
  margin: 1rem;
  position: relative;
  overflow: hidden;
}
.select::after {
  content: "\25BC";
  position: absolute;
  background-color: rgb(253, 187, 45);
  top: 0;
  right: 0;
  padding: 1.16rem;
  pointer-events: none;
}
.select:hover::after {
  background-color: #fff;
  color: rgb(253, 187, 45);
}