Game works

frontend/src/components/SourceCodeLink.vue

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+<template>
+  <a
+    class="source" 
+    href="https://github.com/anatolykopyl/vk-bingo"
+    target="_blank"
+  >
+    Исходный код
+  </a>
+</template>
+
+<style scoped>
+.source {
+  color: #f3f3f350;
+  background-color: #12121250;
+  border-radius: 6px;
+  padding: 3px 6px;
+  position: fixed;
+  width: 20ch;
+  left: 0;
+  right: 0;
+  bottom: 10px;
+  text-align: center;
+  margin: 0 auto;
+  transition: all 0.3s;
+  cursor: pointer;
+  z-index: -1;
+}
+.source:hover {
+  color: #f3f3f3;
+  background-color: #121212;
+  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.6);
+}
+
+@media only screen and (max-width: 520px) {
+  .source {
+    display: none;
+  }
+}
+</style>