Update cvss.css

cvss.css

@@ -297,4 +297,26 @@
 .cvssjs .results sub {
     display: none;
     font-size: x-small;
+}
+
+.cvssjs .copy-button {
+    border-width: 0;
+    background: local;
+    cursor: pointer;
+    user-select: none;
+}
+
+.cvssjs .copy-button:before {
+    display: inline-block;
+    width:16px;
+    height: 16px;
+    background-size:contain;
+    background-repeat: no-repeat;
+    content: " ";
+    user-select: none;
+background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 448 512'%3E%3Cpath fill='%23000' d='M433.941 65.941l-51.882-51.882A48 48 0 0 0 348.118 0H176c-26.51 0-48 21.49-48 48v48H48c-26.51 0-48 21.49-48 48v320c0 26.51 21.49 48 48 48h224c26.51 0 48-21.49 48-48v-48h80c26.51 0 48-21.49 48-48V99.882a48 48 0 0 0-14.059-33.941zM266 464H54a6 6 0 0 1-6-6V150a6 6 0 0 1 6-6h74v224c0 26.51 21.49 48 48 48h96v42a6 6 0 0 1-6 6zm128-96H182a6 6 0 0 1-6-6V54a6 6 0 0 1 6-6h106v88c0 13.255 10.745 24 24 24h88v202a6 6 0 0 1-6 6zm6-256h-64V48h9.632c1.591 0 3.117.632 4.243 1.757l48.368 48.368a6 6 0 0 1 1.757 4.243V112z'%3E%3C/path%3E%3C/svg%3E");
+}
+
+.cvssjs .copy-button:active:before,.cvssjs .copy-button:hover:before {
+    opacity: 0.7;
 }