popup.css

/* General styling */
      body {
        font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
        margin: 0;
        padding: 20px;
        background-color: #181818;
        color: #fff;
        width: 220px;
      }

      h1 {
        font-size: 24px;
        margin-bottom: 20px;
      }

      label {
        display: block;
        margin-bottom: 5px;
      }

      input,
      select,
      button {
        font-size: 14px;
        padding: 8px;
        border: 1px solid #5a5a5a;
        background-color: #282828;
        color: #fff;
        border-radius: 4px;
        outline: none;
        margin-bottom: 10px;
        width: 100%;
        box-sizing: border-box;
      }

      input:focus,
      select:focus,
      button:focus {
        border-color: #66afe9;
      }

      /* Custom styling */
      .form-group {
        margin-bottom: 15px;
      }

      .button-group {
        display: flex;
        justify-content: space-between;
        margin-bottom: 15px;
      }

      #updateApiKeyButton {
        background-color: #007bff;
        cursor: pointer;
        transition: background-color 0.3s;
        margin-right: 10px;
      }

      #updateApiKeyButton:hover {
        background-color: #0056b3;
      }

      #checkBalanceButton {
        background-color: #28a745;
        cursor: pointer;
        transition: background-color 0.3s;
      }

      #checkBalanceButton:hover {
        background-color: #1c7430;
      }