增加bootstrap

src/app.scss

@@ -0,0 +1,132 @@
+@import "bootstrap.css";
+
+.btn-primary:hover {
+  background-color: #007bff;
+}
+
+.btn-secondary:hover {
+  background-color: #6c757d;
+}
+
+.btn-success:hover {
+  background-color: #28a745;
+}
+
+.btn-info:hover {
+  background-color: #17a2b8;
+}
+
+.btn-warning:hover {
+  background-color: #ffc107;
+}
+
+.btn-danger:hover {
+  background-color: #dc3545;
+}
+
+.btn-light:hover {
+  background-color: #f8f9fa;
+}
+
+.btn-dark:hover {
+  background-color: #343a40;
+}
+
+.btn-outline-primary:hover {
+  color: #007bff;
+  background-color: transparent;
+}
+
+.btn-outline-secondary:hover {
+  color: #6c757d;
+  background-color: transparent;
+}
+
+.btn-outline-success:hover {
+  color: #28a745;
+  background-color: transparent;
+}
+
+.btn-outline-info:hover {
+  color: #17a2b8;
+  background-color: transparent;
+}
+
+.btn-outline-warning:hover {
+  color: #ffc107;
+  background-color: transparent;
+}
+
+.btn-outline-danger:hover {
+  color: #dc3545;
+  background-color: transparent;
+}
+
+.btn-outline-light:hover {
+  color: #f8f9fa;
+  background-color: transparent;
+}
+
+.btn-outline-dark:hover {
+  color: #343a40;
+  background-color: transparent;
+}
+
+
+
+.callout {
+  padding: 1.25rem;
+  margin-top: 1.25rem;
+  margin-bottom: 1.25rem;
+  border: 1px solid #eee;
+  border-left-width: .25rem;
+  border-radius: .25rem;
+}
+.callout-header {
+  padding: 0.75rem 1.25rem;
+  border: 1px solid transparent;
+  border-left-width: .25rem;
+}
+
+.callout-warning {
+  border-left-color: #f0ad4e;
+}
+
+.callout-danger {
+  border-left-color: #d9534f;
+}
+
+.callout-info {
+  border-left-color: #5bc0de;
+}
+
+
+.callout-light {
+  border-left-color: #f8f9fa;
+}
+
+.callout-dark {
+  border-left-color: #343a40;
+}
+
+.callout-white {
+  border-left-color: #fff;
+}
+
+.callout-primary {
+  border-left-color: #007bff;
+}
+
+.callout-secondary {
+  border-left-color: #6c757d;
+}
+
+.callout-success {
+  border-left-color: #28a745;
+}
+
+
+.btn-primary-block {
+  padding-top: 0.875rem;
+  padding-bottom: 1rem;
+}