body {
    margin: 20px auto;
    max-width: 900px;
    line-height: 1.6;
    font-size: 18px;
    font-family: 'Georgia', serif;
    color: #444;
    background-color: #eee;
    padding: 0 10px;
}

h1,
h2,
h3 {
    line-height: 1.2;
    margin-top: 0;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid #ccc;
}

.stats {
    text-align: right;
}

.stats p {
    margin: 0 0 10px 0;
    font-weight: bold;
}

#new-game {
    background-color: #444;
    color: #eee;
    border: none;
    padding: 8px 15px;
    font-family: inherit;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s;
}

#new-game:hover {
    background-color: #666;
}

input {
    line-height: 18px;
}

.clearfix {
    clear: both;
}

#cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: stretch;
}
.card {
    position: relative;
    width: 250px;
    min-height: 300px;
    background-color: #cacaca;
    margin: 10px;
    padding: 25px;
    box-sizing: border-box;
}
.card p {
    text-align: center;
}
.card p.task {
    margin: 0;
    hyphens: auto;

    display: flex;
    align-items: center;
    height: 100%;
}
.card .points {
    position: absolute;
    top: 0;
    right: 0;

    background-color: #bde5f8;
    padding: 5px 12px;
}
.card .done {
    position: absolute;
    bottom: 0;
    right: 0;

    background-color: #dff2bf;
    padding: 15px 25px;
    cursor: pointer;
}
.card .skip {
    position: absolute;
    bottom: 0;
    left: 0;

    background-color: #ffbaba;
    padding: 15px 25px;
    cursor: pointer;
}
.card .difficulty-btn {
    display: block;
    text-align: center;
    padding: 15px;
    margin-bottom: 10px;
    background-color: #feefb3;
    cursor: pointer;
}

.card.easy .points {
    background-color: #dff2bf;
}
.card.medium .points {
    background-color: #feefb3;
}
.card.hard .points {
    background-color: #ffbaba;
}

@media (max-width: 600px) {
    body {
        margin: 10px auto;
    }
    header {
        flex-direction: column;
        text-align: center;
    }
    .stats {
        text-align: center;
        margin-top: 10px;
    }
    .card {
        width: 100%;
        max-width: 350px;
        margin: 10px 0;
    }
}

.info,
.success,
.warning,
.error {
    margin: 10px 0;
    padding: 12px;
}
.warning {
    color: #9f6000;
    background-color: #feefb3;
}
.info {
    color: #00529b;
    background-color: #bde5f8;
}
.success {
    color: #4f8a10;
    background-color: #dff2bf;
}
.error {
    color: #d8000c;
    background-color: #ffbaba;
}