#main_content {}
#main_content h2 {font-size:3rem; padding-left: 1rem;position: relative; margin: 1rem 1.5rem; font-weight: bold;}
#main_content h2::after {position: absolute; content:''; display:block; width: 0.3rem; height: 0.3rem; background: #333; border-radius:50%; left: 0; top:50%; margin-top: -0.15rem;}
#main_content ul {display:flex; flex-flow:column;}
#main_content ul li {margin: 0 1.5rem 1rem;}
#main_content ul li .qa_q {background: #fff; border: 1px solid #cbcbcb; color:#333; font-size:2rem; line-height: 1.3; padding: 1.2rem; border-radius: 1rem;}
#main_content ul li .qa_q.on {background: #ef9400; color:#fff; border: 1px solid #ef9400; border-radius: 1rem 1rem 0 0;}
#main_content ul li .qa_a {border:1px solid #ccc; border-top: 0; display: none; font-size:1.8rem; line-height: 1.6; padding: 1.2rem; border-radius: 0 0 1rem 1rem; color: #595959;}
#main_content ul li .qa_a.on {display: block;}