Code changing button color on webpage

So my header video on my webpage is white and I entered the following code to change my logo from being white to black:

<style> 
div.header-title-logo a {
content:url("https://static1.squarespace.com/static/62be1ed4d381561fd3a56266/t/6351781395709916a95a1b92/1666283539559/Brende_Logo_Black.png") !important;     
max-height: 70px;
}

The only problem it changes all my buttons on the page to being white. It was originally a maroon button where it says "Hire Me" both in the navigation menu and on a block in a section. 

it also has made all my section colors white

9 hours ago, JoshBerendes said:

<style> 
div.header-title-logo a {
content:url("https://static1.squarespace.com/static/62be1ed4d381561fd3a56266/t/6351781395709916a95a1b92/1666283539559/Brende_Logo_Black.png") !important;     
max-height: 70px;
}

Where did you place this? In the page header code injection?

It's missing a closing </style> from the end of the code, or did you just not paste it in here? If it's missing that will cause issues.