#Lmain-menu > nav { 
  /* width: 100%; */
  width: 240;
  display: flex;
  justify-content: center;
  position: relative;
}

ul, li {margin: 0; padding: 0; list-style: none;}

#Lmain-menu > li {width: 240; font-family: NanumGothic, serif; float: Left;  position: relative;}

#Lmain-menu > li > a {font-size: 1.10rem; font-weight: bold; color: rgba(208,251,35,0.90);
  text-align: center; text-decoration: none; letter-spacing: 0.05em; display: block;
  padding: 18px 1px; border-bottom: 1px solid rgba(255,255,255,0.35);
  /*
  border-Top: 1px solid rgba(0,0,0,0.15);
  border-right: 1px solid rgba(0,0,0,0.15);
  border-left: 1px solid rgba(0,0,0,0.15);
  border-bottom: 1px solid rgba(0,0,0,0.15);
  text-shadow: 1px 1px 1px rgba(0,0,0,0.2);
  */
}

/*
#Lmain-menu > li:nth-child(1) > a {
  border-left: 1px solid rgba(0,0,0,0.15);
}
*/

#Lsub-menu {
	text-align: right;
	width: 240px;
	position: absolute;
	background-color: #000000;
	background-color: rgba( 0, 0, 0, 0.1 ); /* 0, 0, 0, 0.5 :투명도 50%) */
	opacity: 1;    /* 1: 보이고 0:안보이고) */
	transition: all 0.00s ease-in; /* 0.15 */
}

#Lsub-menu > li {padding: 10px 12px; border-bottom: 1px solid rgba(255,255,255,0.15);}

#Lsub-menu > li >  a {font-size: 0.75rem; color: rgba(255,255,255,0.9); text-decoration: none;}

#Lmain-menu > li:hover #Lsub-menu {opacity: 1; visibility: visible;}

#Lsub-menu > li >  a:hover {text-decoration: underline;}

section {column-width: 15em; background: #b5b5b5; padding: 2em 10em;}