#riken {
 width:900px; 
 padding: 20px;
 margin-left:20px;
 margin-right:20px;
 margin-bottom:10px;
}

#riken h2{
text-align: left; 
}

img.news{
   width: 310px;
   float: right;
 }

img.news2{
   width: 200px;
   float: right;
   margin-top:0px;
   margin-left:10px
 }

img.team{
  max-width: initial; /* 初期状態にリセット */
   width: 160px;
   float: left;
   margin-top:0px;
   margin-left:10px
}

#sankasareta{
        margin: auto;
}