.main-visual {
    height: 160px;
    background-size: cover;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin:0 -15px  15px -15px;
    height: auto;
        z-index: 3;
}
 
 .top_banner_button_wrap{
background-color: #222;
margin-bottom: 2rem;
filter: drop-shadow(4px 4px 4px rgba(255,255,255,0.2));
}

.main-visual img {
    z-index: 2;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
}
 
.main-visual video{
    margin: 0 -15px;
    z-index: 1;
    width: 100%;
        height: auto;
}

.marso img{
width:calc(100% / 3);
}
 div.logo {

padding-right: 1rem;
 }
 div.logo > img{
 width: 100%;
 vertical-align: middle;
 }
  #main,#about_mb{
  background-color: #fff;
  color:#222;
  font-size: 1rem;
  
  }
 #main .sasa{
 color:#004486;
 display: inline-block;
 margin-right: 1rem;
 
 }
 
 #main .miyazaki{
 color:#DE3E2B;
  display: inline-block;
 margin-right: 1rem;
 }
 
  #main .fujita{
 color:#09785E;
  display: inline-block;
 margin-right: 1rem;
 }
#main h2 {
  position: relative;
  padding: 0.25em 0;
  font-size: 1.45rem;
  margin-top: 50px;
    margin-bottom:2rem;
}
.lead{
  position: relative;
  padding: 1em 2rem;
  border:dotted 2px #ddd;
  background-color: #eee;
}

.banner_button_wrap{
background-color: #222;
filter: drop-shadow(4px 4px 4px rgba(0,0,0,0.3));
}
#main h2:after {
  content: "";
  display: block;
  height: 4px;
  margin-top: 4px;
  background: -webkit-linear-gradient(to right, rgb(200, 200, 200), transparent);
  background: linear-gradient(to right, rgb(200, 200, 200), transparent);
}
 h3.mt-3 > small{
 display: block;
 font-size: 0.9rem;
 color:#444;

 }
 
 #main p,#main li{
font-size:1rem;
}

#prof ul{
padding-left: 1rem;
}
#prof ul li {
  position: relative;
  list-style: none;
  margin:0.5rem 0  0.5rem 0;
}
#prof ul li::after {
  display: block;
  content: '';
  position: absolute;
  top: .5em;
  left: -1em;
  width: 5px;
  height: 5px;
  background-color: #aaa;
  border: 1px solid #aaa;
  border-radius: 100%;
}

#about_mb h1{
font-size:1.5rem;
font-weight: bold;
}
#about_mb ol{
padding-left: 1rem;
}
#about_mb h2{
font-size:1rem;
font-weight: bold;
}
#about_mb table{
font-size:0.85rem;

}
@media (min-width: 576px) { 
.main-visual {
    height: auto;

}
 
.main-visual img {
    top: 6px;
}
 
.main-visual video{
    width: 100%;
        height: auto;

}


}

/* Medium devices (tablets, 768px and up)*/
@media (min-width: 768px) { 



}

/* Large devices (desktops, 992px and up)*/
@media (min-width: 992px) { 
 div.logo > img{
 width: 95%;
 }
div.wrap{
display: flex;
}
 div.logo{
 width:50%;
 }
 div.textt{
  width:50%;
 }


.marso img{
width:calc(100% / 4);
}
#top_header{
height: 300px;
}

}

/* Extra large devices (large desktops, 1200px and up)*/
@media (min-width: 1200px) { 

.marso img{
width:calc(100% / 5);
}

}

@media (min-width: 1600px) { 


}