html, body {
    margin: 0;
    padding: 0;
}

.todo-header {
  background-color: #f44336;
  padding: 30px 40px;
  color: white;
  text-align: center;  
}

.todo-text {
    margin: 0px;
    border: none;
    border-radius: 0px;
    width: 75%;
    padding: 10px;
    float: left;
    font-size: 16px;
}

.add-btn {
    padding: 10px;
    width: 25px;
    text-align: center;
    font-size: 16px;
    float: left;
    background: #ccc;
    color: #555;
}

.todo-header:after {
  clear: both;
  content: "";
  display: table;
}


ul {
    margin: 0px;
    padding: 0px;
}

ul li {
  cursor: pointer;
  position: relative;
  padding: 12px 8px 12px 40px;
  list-style-type: none;
  background: #eee;
  font-size: 18px;
  transition: 0.2s;
}

ul li:hover {
      background: #ddd;
}
ul li:nth-child(odd) {
    background: #f9f9f9;
}