fix: pcとのスタイルの差異を修正

src/scss/modules/sp/_gab-animation.scss

@@ -299,6 +299,7 @@
           top: 0; left: 0;
           width: 100%; height: 100%;
           background-color: $theme-bg;
+          border-radius: 50%;
         }
       }
       .char-1 { background-image: url(../images/gab-animation/name/1.png); }

src/scss/modules/tablet/_gab-animation.scss

@@ -291,6 +291,7 @@
           top: 0; left: 0;
           width: 100%; height: 100%;
           background-color: $theme-bg;
+          border-radius: 50%;
         }
       }
       .char-1 { background-image: url(../images/gab-animation/name/1.png); }