How to change the WordPress Plugin Watson Assistant Chatbot BOX Size?

Add margin-top and change values according to your will.

  @media (min-width: 640px) {
      #watson-float {
            margin-top: 100px;
        top: 0;
        right: 0 !important;
      }
    
      #watson-box {
        width: -900% !important;
        height:100% !important;
      }
    
      #message-container {
        height: calc(100% - 2.75em) !important;
      }
    }