fix: remove space under footer (fix #2) (#12)

Author: seonim-ryu

src/styles/layout/_footer.scss

@@ -1,6 +1,6 @@
 .footer {
   position: relative;
-  margin-top: -60px;
+  margin-top: -59px;
   padding: 23px 24px 22px 24px;
   background-color: #f9f9f9;
   border-top: 1px solid #e5e5e5;

src/styles/layout/_lnb.scss

@@ -2,8 +2,8 @@
   position: fixed;
   top: 70px;
   left: 0;
+  bottom: 0;
   width: 260px;
-  height: calc(100vh - 70px);
   min-width: 212px;
   background-color: #fff;
   border-right: 1px solid #ccc;