FLUTTER UI Config widget row with 2 dropdown

I have problem with UI in flutter. Anyone have experienced in widget please help me.

Firstly, here's the target from figma :

both date and time is using dropdown.

This is what it become after my code :

This is my code :

Container(
   alignment: Alignment.centerLeft,
   child: Text('Schedule',
       style: TextStyle(
            color: Color.fromRGBO(78, 125, 150, 1),
            fontSize: 12,
            fontWeight: FontWeight.w600
))),
        
Row(
  mainAxisAlignment: MainAxisAlignment.spaceBetween,
  children: [
        Container(
            height: 40,
            width: MediaQuery.of(context).size.shortestSide * 0.5,
            color: Colors.white,
            child: DropdownButtonFormField(
                onChanged: (value) {},
                  items: _dropdownDate.map((value) =>
                      DropdownMenuItem(
                        child: Text(value),
                        value: value,
                      )).toList(),
                elevation: 4,
                dropdownColor: Colors.white,
                decoration: InputDecoration(
                  prefixIcon: const Icon(Icons.calendar_month, size: 16),
                  hintText: 'Select Date',
                  hintStyle: TextStyle(fontSize: 12),
                  focusedBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(10),
                      borderSide: const BorderSide(
                        width: 0.8,
                        color: Colors.grey,
                      )),
                  enabledBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(10),
                      borderSide: const BorderSide(
                        width: 0.8,
                        color: Colors.grey,
                      )),
                  contentPadding: const EdgeInsets.all(16),
                  fillColor: Colors.white
              ),
            ),
        ),
        Container(
            height: 40,
            width: MediaQuery.of(context).size.shortestSide * 0.3,
            color: Colors.white,
            child: DropdownButtonFormField(
              onChanged: (value) {},
              items: _dropdownTime.map((value) =>
                  DropdownMenuItem(
                    child: Text(value),
                    value: value,
                  )).toList(),
              elevation: 4,
              dropdownColor: Colors.white,
              decoration: InputDecoration(
                  prefixIcon: const Icon(Icons.watch_later_outlined, size: 16),
                  focusedBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(10),
                      borderSide: const BorderSide(
                        width: 0.8,
                        color: Colors.grey,
                      )),
                  enabledBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(10),
                      borderSide: const BorderSide(
                        width: 0.8,
                        color: Colors.grey,
                      )),
                  contentPadding: const EdgeInsets.all(16),
                  fillColor: Colors.white
              ),
            ),
        ),
   ],
),

I want to make the size in the row like this :

50% dropdown Date, 20% space, 30% dropdown Time

and the problem are :

1. I don't know how to configure it as a percentage of row space, not with MediaQuery.of(context).size.width because I already use margin.
2. How to made the percentage is auto fit no matter device the user will used.

Hope to solved this here, thank you before~

Update, after using layout builder :

You should use the LayoutBuilder for that instead of MediaQuery. It's going to give you the available space inside the wrapped widget.

The code changes are below. This is the result:

        child: LayoutBuilder(
          builder: (context, constraints) {
            return Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Container(
                  // height: 40,
                  width: constraints.maxWidth * 0.5,
                  color: Colors.white,
                  child: DropdownButtonFormField(
                    onChanged: (value) {},
                    items: _dropdownDate
                        .map((value) => DropdownMenuItem(
                              child: Text(value),
                              value: value,
                            ))
                        .toList(),
                    elevation: 4,
                    dropdownColor: Colors.white,
                    decoration: InputDecoration(
                        prefixIcon: const Icon(Icons.calendar_month, size: 16),
                        hintText: 'Select Date',
                        hintStyle: TextStyle(fontSize: 12),
                        focusedBorder: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(10),
                            borderSide: const BorderSide(
                              width: 0.8,
                              color: Colors.grey,
                            )),
                        enabledBorder: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(10),
                            borderSide: const BorderSide(
                              width: 0.8,
                              color: Colors.grey,
                            )),
                        contentPadding: const EdgeInsets.all(16),
                        fillColor: Colors.white),
                  ),
                ),
                Container(
                  // height: 40,
                  width: constraints.maxWidth * 0.3,
                  color: Colors.white,
                  child: DropdownButtonFormField(
                    onChanged: (value) {},
                    items: _dropdownTime
                        .map((value) => DropdownMenuItem(
                              child: Text(value),
                              value: value,
                            ))
                        .toList(),
                    elevation: 4,
                    dropdownColor: Colors.white,
                    decoration: InputDecoration(
                        prefixIcon: const Icon(Icons.watch_later_outlined, size: 16),
                        focusedBorder: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(10),
                            borderSide: const BorderSide(
                              width: 0.8,
                              color: Colors.grey,
                            )),
                        enabledBorder: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(10),
                            borderSide: const BorderSide(
                              width: 0.8,
                              color: Colors.grey,
                            )),
                        contentPadding: const EdgeInsets.all(16),
                        fillColor: Colors.white),
                  ),
                ),
              ],
            );
          }
        ),