number of members => ok

src/styles/members.scss

@@ -143,8 +143,25 @@
     justify-content: space-between;
     
     &:first-of-type {
-      background: aquamarine;
+      color: $color-black2;
+      font-weight: bold;
       justify-content: center;
+      white-space: nowrap;
+      
+      &::before, &::after {
+        border-top: 1px solid $color-grey-light5;
+        content: '';
+        position: relative;
+        top: 0.5em;
+        width: 40%;
+      }
+      &::before {
+        right: 5.8%;
+      }
+      
+      &::after {
+        left: 5.8%;
+      }
     }
   }
 }

src/styles/variables.scss

@@ -1,12 +1,14 @@
 // colors
 $color-white: #fff;
 $color-black: #36383b;
+$color-black2: #4a4a4a;
 $color-black-light: #4a4a4a;
 $color-grey-dark: #36383b;
 $color-grey2: #7a7f85;
 $color-grey1: #d7dbe0;
 $color-grey: #898f95;
 $color-grey-mid: #abaaba;
+$color-grey-light5: #9ba0a7;
 $color-grey-light4: #b4b9c0;
 $color-grey-light3: hsla(59, 13%, 86%, 0.2);
 $color-grey-light2: #d8d8d8;