style.css

* {
  margin: 0;
  padding: 0;
}
button {
  border: none;
  outline: none;
  cursor: pointer;
}
input:focus {
  outline: none;
}
body {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgb(242, 162, 162);
  background: linear-gradient(
    90deg,
    rgba(242, 162, 162, 1) 0%,
    rgba(255, 187, 166, 0.6321122198879552) 48%,
    rgba(141, 236, 255, 1) 100%
  );
}
.container {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 30%;
  height: 70%;
  background-color: white;
}
.header {
  text-align: center;
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  background-image: linear-gradient(#fff, #fff),
    linear-gradient(
      to right,
      rgba(242, 162, 162, 1) 0%,
      rgba(255, 187, 166, 0.6321122198879552) 48%,
      rgba(141, 236, 255, 1) 100%
    );
  background-clip: content-box, border-box;
  margin: 1rem 10px 10px;
}
.section {
  width: 100%;
  height: 80%;
  overflow: auto;
}
.section__ul {
  list-style: none;
}
.section__li {
  display: flex;
  justify-content: space-evenly;
  align-items: center;
  padding: 0.5rem;
}
.span {
  width: 80%;
  font-size: 1.2rem;
  color: #383838;
}
.item__delete {
  font-size: 1.2rem;
  background: transparent;
  color: #f2a2a2;
}
.selected {
  text-decoration: line-through;
}
.footer {
  text-align: center;
  padding: 1rem;
}
.footer__form {
  display: flex;
}
.form__input {
  width: 90%;
  height: 1.5rem;
  border: 1px solid b3bec1;
  padding-left: 10px;
}
.form__btn {
  width: 2rem;
  margin-left: 5px;
  background: white;
  border: 1px solid #b3bec1;
  border-radius: 5px;
}