body,html{height:100%;padding:0px;margin:0px;}
.a{background-color:#00bcd4;width:100%;height:90px;overflow:hidden;position:fixed;top:0px}
.b{background-color:red;width:100%;height:100%;overflow:hidden;}
.c{background-color:#cddc39;position:fixed;top:0px;bottom:0px;left:0px;right:0px;display:none;z-index:1}
.d{background-color:pink;position:fixed;bottom:0px;height:10%;width:100%;}
#nave{text-align:center;position:fixed;top:10%;width:100%;height:20%}
#nave img{height:100%;}
#cpanel{}
#hidem,#showm{float:right}