This looks like Chrome's 'Quick Focus Highlight' accessibility feature.

You can disable this by doing the following:

• In the top right of Google Chrome, click the three dots to open the menu
• Press Settings and then go to Advanced
• Click Accessibility from within the Advanced menu
• Turn the slider off for 'Show a quick highlight on the focused object'

You could also insert the following in your URL bar to go directly to it: chrome://settings/accessibility