* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: #2a2a2a;
    color: #ffffff;
}

h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    text-align: center;
}

.hidden {
    display: none !important;
}

.input-area {
    display: flex;
    justify-content: center;
    position: relative;
    padding-bottom: 10px;
    gap: 20px;
}

#task {
    width: 250px;
    padding: 10px;
    outline: none;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.input-area span {
    position: absolute;
    bottom: -14px;
    left: 50%;
    transform: translateX(-120%);
    color: rgb(255, 20, 20);
}

#add {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.show-list {
    position: relative;
    display: flex;
    margin: 20px 0;
    list-style-type: none;
    justify-content: center;
    flex-direction: column-reverse;
    flex-wrap: wrap;
    align-content: center;
}

.show-list li {
    position: relative;
    padding: 10px;
    background-color: #333;
    border-radius: 4px;
    margin: 5px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
    overflow: hidden;
    min-width: 40vw;
    padding-left: 40px;
    cursor: pointer;

    /* unselectable */
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    -o-user-select: none;
}

.show-list li:nth-child(odd) {
    background-color: #444;
}

.show-list li:hover {
    background-color: #555;
    transition: .2s ease-in-out;
}

.show-list li span {
    cursor: pointer;
    max-width: 30vw;
    overflow: hidden;
    text-overflow: ellipsis;
    text-wrap: nowrap;
}

.show-list li.checked {
    position: relative;
    text-decoration: line-through;
    color: #fff;
    background-color: #4CAF50;   
}

.show-list li.checked::before {
    content: '';
    position: absolute;
    color: #fff;
    text-decoration: none !important;
    font-size: 1.2rem;
    left: 18px;
    top: 8px;
    border-width: 0px 2px 2px 0px;
    border-color: #fff;
    border-style: solid;
    height: 14px;
    width: 6px;
    transform: rotate(45deg);
}

.close {
    position: absolute;
    right: 0;
    top: -2px;
    padding: 12px 16px 12px 16px;
}

.close:hover {
    background-color: #f44336;
}

.removeAll {
    position: absolute;
    height: 50px;
    width: 50px;
    bottom: 2vw;
    right: 2vw;
    background-color: #f44336;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    color: black;
    user-select: none;
}

.removeAll::after {
    position: absolute;
    content: 'REMOVE ALL';
    color: #fff;
    text-wrap: nowrap;
    font-size: 1.2rem;
    transform: translateX(-80%);
    background-color: red;
    padding: 8px;
    border-radius: 4px;
    opacity: 0;
    visibility: hidden;
    transition: .2s ease-in-out;
}

.removeAll:hover::after {
    opacity: 1;
    visibility: visible;
}