look and feel tweeks

interface/src/forms/ManageUsersForm.js

@@ -192,7 +192,7 @@ class ManageUsersForm extends React.Component {
               {
                 this.noAdminConfigured() &&
                 <Typography component="div" variant="body1">
-                  <Box bgcolor="error.main" color="error.contrastText" p={2} m={2}>
+                  <Box bgcolor="error.main" color="error.contrastText" p={2} mt={2} mb={2}>
                     You must have at least one admin user configured.
                   </Box>
                 </Typography>

interface/src/forms/SecuritySettingsForm.js

@@ -59,7 +59,7 @@ class SecuritySettingsForm extends React.Component {
               margin="normal"
             />
             <Typography component="div" variant="body1">
-              <Box bgcolor="primary.main" color="primary.contrastText" p={2} m={2}>
+              <Box bgcolor="primary.main" color="primary.contrastText" p={2} mt={2} mb={2}>
                 If you modify the JWT Secret, all users will be logged out.
               </Box>
             </Typography>

interface/src/forms/UserForm.js

@@ -74,7 +74,7 @@ class UserForm extends React.Component {
               />
             </FormGroup>
           </DialogContent>
-          <DialogActions >
+          <DialogActions>
             <Button variant="contained" color="primary" className={classes.button} type="submit" onClick={this.submit}>
               Done
             </Button>