body{
     background-color: #696969;
     color: white;
     width: 1200px;
     margin: 0 auto;
     border:solid 2px white;
}
header,nav {
     border: solid 1px;
}
#large_block{
     width: 1200px;
     height: 50px;

}
.blockA{
     width: 200px;
     height: 50px;
     float:left;
}
.blockB{
     width: 200px;
     height: 50px;
     float:left;
}
.blockC{
     width: 200px;
     height: 50px;
     float:left;
}
.blockD{
     width: 200px;
     height: 50px;
     float:left;
}
.blockE{
     width: 200px;
     height: 50px;
     float:left;
}
.blockF{
     width: 790px;
     height: 1000px;
     float:left;

}
.blockG{
     width: 390px;
     height: 1000px;
     float:left;

}