styles.css

body {
  font-family: Verdana, sans-serif;
  background-color: #dcd4e8;
}

h1 {
  margin: 0 auto;
  text-align: center;
  padding: 10px 20px;
  font-size: 24px;
  font-weight: bold;
  color: #26222c;
}

img {
  padding: 0;
  display: block;
  width: 100%;
  margin: 10px auto;
}

input {
  font-size: 18px;
  color: #4d4d4d;
  background-color: #f7f7f7;
  width: 100%;
  padding: 13px 13px 13px 20px;
  box-sizing: border-box;
  border: 3px solid #febad3;
}

input:focus {
  background: #fff;
  border: 3px solid #febad3;
  outline: none;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

li {
  background: #fff;
  height: 40px;
  line-height: 40px;
  color: #000;
}

li:nth-child(2n) {
  background: #f7f7f7;
}

span {
  background: #e74c3c;
  margin-right: 5px;
  height: 40px;
  text-align: center;
  color: white;
  width: 0;
  display: inline-block;
  transition: 0.2s linear;
  opacity: 0;
}

li:hover span {
  width: 40px;
  opacity: 1;
 }

#container {
  width: 360px;
  margin: 100px auto;
  background: #f7f7f7;
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.5);
}

.fa-pencil-alt {
  float: right;
}

.completed {
  color: gray;
  text-decoration: line-through;
}