Using Showroom, a Genesis Child Theme.

.header-image .site-header .title-area {
	background: url("https://thvcreative.com/wp-content/uploads/2017/08/Logo5-300x68.jpg") no-repeat scroll left top;
	background-size: 400px 90px;
}

but, unfortunately, the size that is being used is 300 x 68 so it will only display properly at that size. You need to find where it’s injected into the theme Appearance > Customise and put the logo in at the size you want.