.article_section-accordion-ttl span::before {
    display: none;
}

@media (max-width: 767px) {
.block767{
    display: block;
}
.article_section-accordion-ttl {
    padding: 20px 50px 20px 15px;
    font-size: 14px;
    line-height: 1.4em;
}
}