.collapsible {
    background-color: inherit;
    color: black;
    width: 50%;
    outline: none;
    border: none;
    border-bottom: 1px solid gray;
    text-align: left;
    font-size: 20px;
    padding: 10px;
    cursor: pointer;
}

.collapsible:before {
    content: '\02795';
    font-size: 13px;
    float: left;
    margin-right: 10px;
}

.active:before {
    content: "\2796"; /* Unicode character for "minus" sign (-) */
}

.collapsible-content {
    padding-left: 10px;
    display: none;
    overflow: hidden;
    width: 50%;
}

/* Mobile */

@media screen and (max-width: 1050px) {

    .collapsible {
        width: 100%;
    }

}