Hello,
Please add this code to your custom CSS box:

@media (max-width: 480px){
#logo img {
    height: 83px;
    margin-top: -36px;
}
}

Let us know.
Best regards!

Hello,
Please add !important to the height attribute:

@media (max-width: 480px){
#logo img {
    height: 83px !important;
    margin-top: -36px;
}
}

This is what i get when i add this code: (https://www.awesomescreenshot.com/image/1452120/9c4ab9ab98238716e1efdc140497c97b)
Let us know.
Best regards!

Hello,

Is this image you uploaded, bigger than the previous? However, you only need to change the values of the last code, to match this new logo. I tried with these values:

@media (max-width: 480px){
#logo img {
    height: 60px !important;
    margin-top: -18px;
}}

This is what i get: screenshot.
Let us know.

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Best regards!