In my experience, the last thing you'd want to do is to have a screaming match with a toddler having a tantrum, haha! But I understand how exhausting it can be.
Try speaking to them in a low, firm voice. This is WAY more effective than yelling; it calms them down and forces them to lower the volume of their own voice. They tend to mimic your tone even if they don't realize it.
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Protector of 1 fun loving lass