* {
    box-sizing: border-box;
}

body {
    font: 1em/1.5 sans-serif;
    margin: 0 auto;
    max-width: 30em;
    padding: 1em;
}

input[type=text] {
    font: 1em/1.5 sans-serif;
    padding: .5em .75em;
    width: 100%;
}

.grocery-list {
    list-style: none;
    padding: 0;
}

.list-item {
    display: flex;
    margin-bottom: .5em;
}

.list-item .description {
    flex: 1;
}

.list-item .description.checked {
    color: #333;
    text-decoration: line-through;
}

.list-item .check {
    padding-right: .5em;
}