feat tour: Show new users around

src/less/components/header.less

@@ -28,7 +28,7 @@ header {
     border: none;
 
     width: 8rem;
-    height: 2rem;
+    height: 4rem;
 
     &::before {
       content: '';

src/less/styles/all.less

@@ -2,6 +2,7 @@
 @import 'shadows';
 @import 'buttons';
 @import 'forms';
+@import 'tour';
 
 .coming-soon::after {
   content: 'soon...';

src/less/styles/tour.less

@@ -0,0 +1,88 @@
+#wrapper::after {
+  content: '';
+
+  background: rgba(0, 0, 0, 0);
+
+  position: fixed;
+  top: 0;
+  left: 0;
+
+  width: 100vw;
+  height: 100vh;
+
+  pointer-events: none;
+
+  transition: background 0.5s ease;
+}
+
+.tour {
+  &::after {
+    background: rgba(0, 0, 0, 0.55) !important;
+  }
+
+  .tour-item {
+    position: relative;
+
+    z-index: 1;
+  }
+  .tour-item::after {
+    content: '';
+
+    position: absolute;
+    left: 50%;
+    top: 50%;
+
+    width: 1rem;
+    height: 1rem;
+
+    margin-top: -0.5rem;
+    margin-left: -0.5rem;
+
+    border-radius: 50%;
+
+    background: #50E3C2;
+
+    opacity: 1;
+
+    transform: scale(0);
+
+    animation: pulse 2s ease-out infinite;
+  }
+
+  .tour-dialog {
+    display: block;
+
+    box-sizing: border-box;
+
+    width: 90vw;
+
+    text-align: center;
+
+    padding: 1rem 2rem;
+
+    position: fixed;
+    left: 50%;
+    top: 50%;
+
+    background: @light-gray;
+
+    border-radius: 2rem;
+
+    .shadow-16;
+
+    transform: translate(-50%, -50%);
+
+    z-index: 5;
+  }
+}
+
+.tour-dialog {
+  display: none;
+}
+
+@keyframes pulse {
+  100% {
+    opacity: 0;
+    transform: scale(5);
+  }
+}