index.css

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

button {
    margin: 0;
    padding: 0;
    border: 0;
    background: none;
    font-size: 100%;
    vertical-align: baseline;
    font-family: inherit;
    font-weight: inherit;
    color: inherit;
    -webkit-appearance: none;
    appearance: none;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.4em;
    background: #f5f5f5;
    color: #4d4d4d;
    min-width: 230px;
    max-width: 550px;
    margin: 0 auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-weight: 300;
}

:focus {
    outline: 0;
}

.hidden {
    display: none;
}

.todoapp {
    background: #fff;
    margin: 130px 0 40px 0;
    position: relative;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2),
        0 25px 50px 0 rgba(0, 0, 0, 0.1);
}

.todoapp input::-webkit-input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}

.todoapp input::-moz-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}

.todoapp input::input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}

.todoapp h1 {
    position: absolute;
    top: -155px;
    width: 100%;
    font-size: 100px;
    font-weight: 100;
    text-align: center;
    color: rgba(175, 47, 47, 0.15);
    -webkit-text-rendering: optimizeLegibility;
    -moz-text-rendering: optimizeLegibility;
    text-rendering: optimizeLegibility;
}

.new-todo,
.edit {
    position: relative;
    margin: 0;
    width: 100%;
    font-size: 24px;
    font-family: inherit;
    font-weight: inherit;
    line-height: 1.4em;
    border: 0;
    color: inherit;
    padding: 6px;
    border: 1px solid #999;
    box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.new-todo {
    padding: 16px 16px 16px 60px;
    border: none;
    background: rgba(0, 0, 0, 0.003);
    box-shadow: inset 0 -2px 1px rgba(0,0,0,0.03);
}

.main {
    position: relative;
    z-index: 2;
    border-top: 1px solid #e6e6e6;
}

.toggle-all {
    width: 1px;
    height: 1px;
    border: none; /* Mobile Safari */
    opacity: 0;
    position: absolute;
    right: 100%;
    bottom: 100%;
}

.toggle-all + label {
    width: 60px;
    height: 34px;
    font-size: 0;
    position: absolute;
    top: -52px;
    left: -13px;
    -webkit-transform: rotate(90deg);
    transform: rotate(90deg);
}

.toggle-all + label:before {
    content: '❯';
    font-size: 22px;
    color: #e6e6e6;
    padding: 10px 27px 10px 27px;
}

.toggle-all:checked + label:before {
    color: #737373;
}

.todo-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.todo-list li {
    position: relative;
    font-size: 24px;
    border-bottom: 1px solid #ededed;
}

.todo-list li:last-child {
    border-bottom: none;
}

.todo-list li.editing {
    border-bottom: none;
    padding: 0;
}

.todo-list li.editing .edit {
    display: block;
    width: 506px;
    padding: 12px 16px;
    margin: 0 0 0 43px;
}

.todo-list li.editing .view {
    display: none;
}

.todo-list li .toggle {
    text-align: center;
    width: 40px;
    /* auto, since non-WebKit browsers doesn't support input styling */
    height: auto;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto 0;
    border: none; /* Mobile Safari */
    -webkit-appearance: none;
    appearance: none;
}

.todo-list li .toggle {
    opacity: 0;
}

.todo-list li .toggle + label {
    /*
            Firefox requires `#` to be escaped - https://bugzilla.mozilla.org/show_bug.cgi?id=922433
            IE and Edge requires *everything* to be escaped to render, so we do that instead of just the `#` - https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7157459/
    */
    background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E');
    background-repeat: no-repeat;
    background-position: center left;
}

.todo-list li .toggle:checked + label {
    background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E');
}

.todo-list li label {
    word-break: break-all;
    padding: 15px 15px 15px 60px;
    display: block;
    line-height: 1.2;
    transition: color 0.4s;
}

.todo-list li.completed label {
    color: #d9d9d9;
    text-decoration: line-through;
}

.todo-list li .destroy {
    display: none;
    position: absolute;
    top: 0;
    right: 10px;
    bottom: 0;
    width: 40px;
    height: 40px;
    margin: auto 0;
    font-size: 30px;
    color: #cc9a9a;
    margin-bottom: 11px;
    transition: color 0.2s ease-out;
}

.todo-list li .destroy:hover {
    color: #af5b5e;
}

.todo-list li .destroy:after {
    content: '×';
}

.todo-list li:hover .destroy {
    display: block;
}

.todo-list li .edit {
    display: none;
}

.todo-list li.editing:last-child {
    margin-bottom: -1px;
}

.footer {
    color: #777;
    padding: 10px 15px;
    height: 20px;
    text-align: center;
    border-top: 1px solid #e6e6e6;
}

.footer:before {
    content: '';
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 50px;
    overflow: hidden;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2),
        0 8px 0 -3px #f6f6f6,
        0 9px 1px -3px rgba(0, 0, 0, 0.2),
        0 16px 0 -6px #f6f6f6,
        0 17px 2px -6px rgba(0, 0, 0, 0.2);
}

.todo-count {
    float: left;
    text-align: left;
}

.todo-count strong {
    font-weight: 300;
}

.filters {
    margin: 0;
    padding: 0;
    list-style: none;
    position: absolute;
    right: 0;
    left: 0;
}

.filters li {
    display: inline;
}

.filters li a {
    color: inherit;
    margin: 3px;
    padding: 3px 7px;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 3px;
}

.filters li a:hover {
    border-color: rgba(175, 47, 47, 0.1);
}

.filters li a.selected {
    border-color: rgba(175, 47, 47, 0.2);
}

.clear-completed,
html .clear-completed:active {
    float: right;
    position: relative;
    line-height: 20px;
    text-decoration: none;
    cursor: pointer;
}

.clear-completed:hover {
    text-decoration: underline;
}

.info {
    margin: 65px auto 0;
    color: #bfbfbf;
    font-size: 10px;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
    text-align: center;
}

.info p {
    line-height: 1;
}

.info a {
    color: inherit;
    text-decoration: none;
    font-weight: 400;
}

.info a:hover {
    text-decoration: underline;
}

/*
        Hack to remove background from Mobile Safari.
        Can't use it globally since it destroys checkboxes in Firefox
*/
@media screen and (-webkit-min-device-pixel-ratio:0) {
    .toggle-all,
    .todo-list li .toggle {
        background: none;
    }

    .todo-list li .toggle {
        height: 40px;
    }
}

@media (max-width: 430px) {
    .footer {
        height: 50px;
    }

    .filters {
        bottom: 10px;
    }
}