polishing .css files and reducing the code size as much as possible. Adding some new colors to the Theme

Client/src/Components/PopupModals/DualButtonPopupModal/dualButtonPopupModal.css

@@ -1,11 +1,3 @@
-:root {
-  --popup-color-border-0: #f2f2f2;
-  --popup-color-0: #101828;
-  --popup-color-1: #475467;
-  --color-0: #1570ef;
-  --color-1: #175cd3;
-}
-
 .dual-button-popup-modal-holder {
   width: 380px;
   height: 130px;
@@ -13,19 +5,19 @@
   padding: 30px;
   box-shadow: 0px 8px 8px -4px rgba(16, 24, 40, 0.03),
     0px 20px 24px -4px rgba(16, 24, 40, 0.08);
-  border: 1px solid var(--popup-color-border-0);
-  border-radius: 4px;
+  border: 1px solid var(--env-var-color-9);
+  border-radius: var(--env-var-radius-1);
 }
 
 .dual-button-popup-modal-subject {
-  color: var(--popup-color-0);
+  color: var(--env-var-color-1);
   font-weight: bolder;
   font-size: 16px;
 }
 
 .dual-button-popup-modal-description {
-  color: var(--popup-color-1);
-  font-size: 13px;
+  color: var(--env-var-color-2);
+  font-size: var(--env-var-font-size-medium);
   margin-top: 10px;
 }
 
@@ -42,19 +34,19 @@
   width: 145px;
   height: 35px;
   padding: 5px 20px;
-  background-color: var(--color-0);
-  border: 1px solid var(--color-1);
-  border-radius: 4px;
+  background-color: var(--env-var-color-3);
+  border: 1px solid var(--env-var-color-10);
+  border-radius: var(--env-var-radius-1);
   margin: 5px 0;
   margin-left: 20px;
-  color: white;
+  color: var(--env-var-color-8);
   cursor: pointer;
-  font-size: 13px;
+  font-size: var(--env-var-font-size-medium);
 }
 
 .transparent-discard-button {
   border: none;
   background-color: transparent;
   margin: 5px 10px;
-  font-size: 13px;
+  font-size: var(--env-var-font-size-medium);
 }