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HTML 

              
                <!--
Twitter: https://twitter.com/tjgillweb
Codepen: https://codepen.io/tjgill/
Github: https://github.com/tjgillweb/
-->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"
        integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<div class="todoList">
        <div class="cover-img">
            <div class="cover-inner">
                <h3>Vacation</h3>
            </div>
        </div>
        <div class="content">
            <form class="add">
                <input type="text" name="add" placeholder="Add item...">
                <div class="input-buttons">
                    <a href="#" class="add-todo">
                        <i class="fas fa-plus add"></i>
                    </a>
                </div>
            </form>
            <ul class="todos">
                <li>
                    <input type="checkbox" id="todo_1" />
                    <label for="todo_1">
                        <span class="check"></span>Buy Flight Tickets
                    </label>
                    <i class="far fa-trash-alt delete"></i>
                </li>
                <li>
                    <input type="checkbox" id="todo_2" />
                    <label for="todo_2">
                        <span class="check"></span>Find AirBnB
                    </label>
                    <i class="far fa-trash-alt delete"></i>
                </li>
                <li>
                    <input type="checkbox" id="todo_3" />
                    <label for="todo_3">
                        <span class="check"></span> Look up things to do
                    </label>
                    <i class="far fa-trash-alt delete"></i>
                </li>
                <li>
                    <input type="checkbox" id="todo_4" />
                    <label for="todo_4">
                        <span class="check"></span> Passport
                    </label>
                    <i class="far fa-trash-alt delete"></i>
                </li>
            </ul>
        </div>

    </div>

<div class="social">
  <ul>
			<li>
				<a href="https://twitter.com/tjgillweb" target="_blank">
					<i class="fab fa-twitter"></i>
				</a>
			</li>
			<li>
				<a href="https://github.com/tjgillweb/" target="_blank">
					<i class="fab fa-github"></i>
				</a>
			</li>
			<li>
				<a href="https://www.linkedin.com/in/taranjot-gill-2704552a/" target="_blank">
					<i class="fab fa-linkedin"></i>
				</a>
			</li>
		</ul>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Nunito:600,700&display=swap');

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}

body {
  min-height: 450px;
  height: 100vh;
  margin: 0;
  background: radial-gradient(ellipse farthest-corner at center top, #f39264 0%, #f2606f 100%);
  color: #fff;
  font-family: 'Nunito', sans-serif;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/*-------------------- ToDo List -------------------*/
.todoList {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 320px;
  height: 500px;
  background: #fff;
}

/** Header Image **/
.cover-img {

  .cover-inner {
    background: url('https://images.unsplash.com/photo-1516483638261-f4dbaf036963?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1533&q=80');
    height: 190px;
    background-size: cover;
    background-position: 10% 20%;
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    position: relative;

    &::after {
      background: rgba(0, 0, 0, 0.3);
      content: "";
      top: 0;
      left: 0;
      position: absolute;
      width: 100%;
      height: 100%;
      border-top-left-radius: 10px;
      border-top-right-radius: 10px;
    }

    h3 {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      font-family: 'Nunito', sans-serif;
      text-transform: uppercase;
      font-size: 2.8rem;
      z-index: 10;
      font-weight: 700;
    }
  }
}

/* Main Content */
.content {
  padding: 10px 20px;

  form {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    padding: 0 10px 0 5px;
    border-bottom: 1px solid #8e979c;
  }

  form>* {
    background: transparent;
    border: none;
    height: 35px;
  }

  input[type=text] {
    //flex-basis: 80%;
    //padding: 0 5px;
    font-weight: 700;
    font-size: 1.2rem;
    color: #6C717B;
  }

  .input-buttons {
    //border-bottom: 1px solid #8e979c;
    //flex-basis: 20%;
    //text-align: center;
    //padding: 0px 0 0 10px;
  }

  .input-buttons a {
    text-decoration: none;
  }

  .input-buttons i {
    margin-top: 5px;
    font-size: 20px;
    color: #8e979c;
  }

  ul.todos {
    margin-left: 0;
    padding: 0;
    list-style: none;
    height: 220px;
    overflow: auto;
  }

  li {
    user-select: none;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
  }

  li i {
    color: #6C717B;
    font-size: 15px;
    cursor: pointer;
    padding: 5px 10px;
  }

  input[type=checkbox] {
    display: none
  }

  input[type=checkbox]+label {
    color: #6C717B;
    font-size: 15px;
    cursor: pointer;
    position: relative;
    border-radius: 3px;
    display: inline-block;
    padding: 5px 5px 5px 30px;
  }

  input[type=checkbox]+label:hover {
    color: #353A42;
    background-color: #F4F7FA;
  }

  input[type=checkbox]+label span.check {
    left: 4px;
    top: 50%;
    position: absolute;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    display: block;
    background: white;
    border-radius: 3px;
    border: 1px solid #b8bfcc;
    box-shadow: 0 2px 3px #F0F4F8;
  }

  input[type=checkbox]:checked+label {
    color: #AEB7C6;
    text-decoration: line-through;
  }

  input[type=checkbox]:checked+label span.check {
    background-color: transparent;
    border-color: transparent;
    box-shadow: none;
  }

  input[type=checkbox]+label span.check::after {
    width: 100%;
    height: 100%;
    content: '';
    display: block;
    position: absolute;
    background-image: url('https://tjgillweb.github.io/Vacation-Todo-App/images/tick.svg');
    background-repeat: no-repeat;
    background-position: center;
    background-size: 16px 16px;
    transform: scale(0);
    transition: transform 300ms cubic-bezier(0.3, 0, 0, 1.5);
  }

  input[type=checkbox]:checked+label span.check::after {
    transform: scale(1);
  }

  input[type=checkbox]+label span.check::before {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    content: '';
    position: absolute;
    border-radius: 50%;
    background: #8798AA;

    opacity: .8;
    transform: scale(0);
  }

  input[type=checkbox]:checked+label span.check::before {
    opacity: 0;
    transform: scale(1.3);
    transition: opacity 300ms cubic-bezier(0.2, 0, 0, 1), transform 400ms cubic-bezier(0.3, 0, 0, 1.4);
  }
}

/** Social Icons **/
@media(max-width: 767px){
  .social{
    display: none;
  }
}
@media(min-width: 767px){
.social{
  position: absolute;
  right: 0;
  top: 33.33%;
}
.social ul {
	display: flex;
  flex-direction: column;
	list-style: none;
	padding: 0;
	margin: 0;
}

.social ul li {
	margin: 5px 10px;
}

.social ul li a {
	color: #403f4c;
	font-size: 25px;
	height: 50px;
	width: 50px;
	text-decoration: none;
}

.social ul li a:hover {
	color: #272523;
}
}
!

JS 

              
                const submitForm = document.querySelector('.add');
const addButton = document.querySelector('.add-todo');
const todoList = document.querySelector('.todos');
const list = document.querySelectorAll('.todos li'); //gives a NodeList of all li's
let listLength = list.length;

const generateTemplate = (todo) => {

    const html = `<li>
                    <input type="checkbox" id="todo_${listLength}" />
                    <label for="todo_${listLength}">
                        <span class="check"></span>${todo}
                    </label>
                    <i class="far fa-trash-alt delete"></i>
                  </li>`
    todoList.innerHTML += html;
};

function addTodos(e) {
    e.preventDefault();
    const todo = submitForm.add.value.trim(); //trim extra space in input
    if (todo.length) { // to check whether the input is empty
        listLength = listLength + 1; // to update the checkbox id when we add a new list item
        generateTemplate(todo);
        submitForm.reset();
    }

}
//add todos
submitForm.addEventListener('submit', addTodos);
addButton.addEventListener('click', addTodos);

function deleteTodos(e) {
    if (e.target.classList.contains('delete')) {
        e.target.parentElement.remove();
    }
}
//delete todos
todoList.addEventListener('click', deleteTodos);
!
999px

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