* {
    box-sizing: border-box;
}

body {

    font-family: 'Roboto', sans-serif;
}

.body_div {
    margin-top: 100px;
}

.active {
    background-color: rgba(31,66,195,0.3);
}

.buttons {
    float: left;
    margin-right: 5px;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    display: inline-block;
    font-size: 16px;
}

#solve {
    background-color: #f53978;
    font-size: 16px;
    margin-top: 25px;
}

#help {
    width: 40px;
    background-color: #f53978;
    font-size: 16px;
    margin-top: 25px;
}

.column {
    float: left;
    width: 50%;
    padding-left: 69px;
    padding-right: 69px;
    padding-top: 20px;
}

/* Clear floats after the columns */
.row:after {
    content: "";
    display: table;
    clear: both;
}

article {
    position: relative;
    width: 100%;
    height: 30px;
    margin: 5px;
    float: left;
    border: 2px solid #f53978;
    box-sizing: border-box;
    color: white;
}

article div {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 25px;
    transition: .5s ease;
}

article input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 30px;
    opacity: 0;
    cursor: pointer;
}

input[type=checkbox]:checked ~ div {
    background-color: #f53978;
}

.title_text {
    font-size: 3rem;
    color: #ffffff;
    letter-spacing: normal;
    font-weight: 700;
    text-transform: none;
    text-align: center;
}

.title_sub_text {
    font-size: 1.25rem;
    color: #ffffff;
    letter-spacing: normal;
    font-weight: 700;
    text-transform: none;
    text-align: center;
    padding-bottom: 30px;
}

.trainer_info {
    font-size: 1.25rem;
    color: white;
    letter-spacing: normal;
    font-weight: 700;
    text-transform: none;
    text-align: center;
    padding-bottom: 30px;
    margin-top: 20px;
}

.hints_box {
    padding-top: 4rem;
    margin: auto;
}

details summary::-webkit-details-marker {
    display: none;
}

details summary {
    width: 100%;
    padding: 0.5rem 0;
    border-top: 2px solid #f53978;
    position: relative;
    cursor: pointer;
    font-size: 1.25rem;
    font-weight: 300;
    list-style: none;
}

details summary:after {
    content: "+";
    color: #f53978;
    position: absolute;
    font-size: 2.25rem;
    line-height: 0;
    margin-top: 0.75rem;
    right: 0;
    font-weight: 200;
    transform-origin: center;
    transition: 200ms linear;
}

details[open] summary:after {
    transform: rotate(45deg);
    font-size: 2.75rem;
}

details summary {
    outline: 0;
    color: white;
    font-size: 1.5rem;
}

details p {
    font-size: 1.25rem;
    margin: 0 0 1rem;
    padding-top: 1rem;
    color: white;
}