<button
            type="submit"
            name="submit"
            color="primary"
            className="test-class"
            style={{
              background: "var(--back-color)",
              borderRadius: "5px",
              color: "var(--text-color)",
              cursor: "pointer",
              padding: "10px",
              border: "none",
              fontSize: "1rem",
              ":focus": {
                outline: "none",
              },
            }}
          >
            LOGIN
          </button>
and if I change ":focus" to "&:focus", it still doesn't work.
 
    