.sec20{
    position: relative;
    width: 100%;
    height: 50vh;
}
.sec20 img{
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.sec20 h4{
    position: absolute;
    font-size: 30px;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}
/* sec21 */
.sec21{
    margin: 0 auto 40px;
    max-width: 1000px;
    padding: 0 20px;
}
.sec21 h4{
    margin-top: 40px;
    font-size: 20px;
}
.sec21 a{
    color: #fff;
    padding: 10px 15px;
    margin: 0 3px;
    border-radius: 20px;
    background-color: blue;
}
.sec21 .accordion-area{
    list-style: none;
    width: 100%;
}
.sec21 .accordion-area ul{
    list-style: none;
}
.sec21 .accordion-area li{
    margin: 10px 0;
}

.sec21 .accordion-area section {
  border: 1px solid #ccc;
}

/*アコーディオンタイトル*/
.sec21 .title {
    position: relative;/*+マークの位置基準とするためrelative指定*/
    cursor: pointer;
    font-size:1rem;
    font-weight: normal;
    padding: 3% 3% 3% 50px;
    transition: all .5s ease;
    background-color: #1D1D1D;
}

/*アイコンの＋と×*/
.sec21 .title::before,
.sec21 .title::after{
    position: absolute;
    content:'';
    width: 15px;
    height: 2px;
    background-color: #fff;
    
}
.sec21 .title::before{
    top:48%;
    left: 15px;
    transform: rotate(0deg);
    
}
.sec21 .title::after{    
    top:48%;
    left: 15px;
    transform: rotate(90deg);

}


.sec21 .title.close::before{
    transform: rotate(45deg);
}

.sec21 .title.close::after{
    transform: rotate(-45deg);
}

.sec21 .box {
    display: none;
    background: #000;
    margin:0 3% 0 3%;
    padding: 3%;
}

@media screen and (max-width: 450px){
    .sec20 h4 {
        font-size: 27px;
    }
	.sec21 a {
    padding: 5px 10px;
}
    .sec21 .title {
        font-size: 14px;
    }
}