Toast notifications.

components/common/Toast.module.css

@@ -0,0 +1,25 @@
+.toast {
+  position: absolute;
+  top: 30px;
+  left: 0;
+  right: 0;
+  width: 300px;
+  border-radius: 5px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 8px 16px;
+  color: var(--gray50);
+  background: var(--green400);
+  margin: auto;
+  z-index: 2;
+  cursor: pointer;
+}
+
+.message {
+  font-size: var(--font-size-normal);
+}
+
+.close {
+  margin-left: 20px;
+}