Optimize directory structure. Optimize Slogan.

src/assets/css/components/common/fit-center.scss

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+.fit-center {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  width: 100%;
+  height: 100%;
+}

src/assets/css/components/common/fit-fullscreen.scss

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+.fit-fullscreen {
+  position: relative;
+  width: 100%;
+  height: 100vh;
+}

src/assets/css/components/common/hide-scrollbar.scss

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+.hide-scrollbar-mask {
+  width: 100%;
+  height: 100%;
+  overflow: hidden;
+}
+
+.hide-scrollbar-selection {
+  position: relative;
+  overflow: scroll;
+  scrollbar-width: none;
+  -ms-overflow-style: none;
+}
+
+.hide-scrollbar-selection::-webkit-scrollbar {
+  display: none;
+}

src/assets/css/components/common/loading-mask.scss

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+.loading-mask {
+  position: absolute;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  width: 100%;
+  height: 100%;
+  z-index: 100;
+  background-color: rgba(200, 200, 200, 0.2);
+}

src/assets/css/components/home/slogan.scss

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+@use "../../mixins" as mixins;
+
+.center-box {
+  display: flex;
+  flex-direction: column;
+}
+
+.big-logo {
+  font: {
+    size: 5em;
+    weight: bold;
+  };
+  color: #666;
+}
+
+.slogan {
+  font: {
+    size: 1.3em;
+    style: italic;
+  };
+  color: #666;
+
+  .cursor {
+    font-style: normal;
+    animation: 1s infinite;
+
+    @include mixins.unique-keyframes {
+      0% {
+        opacity: 0;
+      }
+      50% {
+        opacity: 1;
+      }
+      100% {
+        opacity: 0;
+      }
+    }
+  }
+}
+
+.scroll-down {
+  position: absolute;
+  bottom: 10px;
+  padding: 20px;
+  cursor: pointer;
+  animation: 1.5s infinite;
+  @include mixins.unique-keyframes {
+    0%,
+    100% {
+      -ms-filter: none;
+      filter: none;
+      opacity: 1;
+      transform: translateY(10px);
+    }
+
+    50% {
+      -ms-filter: alpha(opacity=40);
+      filter: alpha(opacity=40);
+      opacity: .4;
+      transform: translateY(-10px);
+    }
+  }
+}