Update style

* Add new default style to project

* Add new BaseButton component

* Remove link to stylesheet in index.html

* Add import for default style

* Update styles and structure for project components

scss/_all.scss

@@ -0,0 +1,5 @@
+* {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}

scss/_btn.scss

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+@mixin btn($revese: false) {
+
+}

scss/_colors.scss

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+// default colors
+$gray: #fafafa;
+$dark-gray: #4f4f4f;
+
+// default colors for style
+$text-color: #2c3e50;
+$bg-color: white;

scss/_root.scss

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+@import "colors";
+
+:root {
+  --font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+  --dark-gray-color: #{$dark-gray};
+  --gray-color: #{$gray};
+  --text-color: #{$text-color};
+  --bg-color: #{$bg-color};
+}

scss/default.scss

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+@import "root";
+@import "all";
+
+a {
+  text-decoration: none;
+}
+h2 {
+  font-size: 1.8em;
+  margin-bottom: 10px;
+}
+p {
+  font-size: 1.1em;
+  line-height: 1.4em;
+  padding-bottom: 10px;
+}
+.container {
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 15px;
+}