body{
 background-image: url(img/bg1.jpg);
 background-repeat:  no-repeat;
 background-attachment: fixed;
 font-family: "Meiryo", "メイリオ";
 color: #ffffff;
 font-size: 0.8rem;
}

.title{
 font-size: 50px;
 color: blue;
 width: 1010px;
 text-align:left;
 padding: 5px;
 margin: 5px auto;

}
.c1{
 text-align: center;
}
.c2{
 text-align: center;
 margin-top: 100px;
}

.menu{
 background-color: rgb( 0 0 0 / 0.7);
 width:200px;
 height:400px;
 text-align:left;
 padding: 5px;
 white-space:nowrap
 border-width: 1px;
 border: 5px double #ffffff;
} 

.content{
 background-color: rgb( 0 0 0 / 0.7);
 width:800px;
 text-align:center;
 padding: 5px;
 margin-left:10px;
 white-space:nowrap

 border-width: 1px;
 border: 5px double #ffffff;
}

.container{
 display:flex;
 justify-content: center;
 white-space:nowrap
}