static displayBoughtUpgrade(name) {
    const upgradeButton = document.querySelector(`#${name}`);
    upgradeButton.innerHTML = 'check';
    upgradeButton.style.color = 'green';
  }
// changes shopping cart to green checkmark when upgrade is bought
changes shopping cart to green checkmark when upgrade is bought
changes shopping cart to green checkmark when upgrade is bought
static displayBoughtUpgrade(name) {
    const upgradeButton = document.querySelector(`#${name}`);
    upgradeButton.innerHTML = 'check';
    upgradeButton.style.color = 'green';
  }
static displayBoughtUpgrade ( name ) { const upgradeButton = document . querySelector ( ` ${ name } ` ) ; upgradeButton . innerHTML = 'check' ; upgradeButton . style . color = 'green' ; }
changes shopping cart to green checkmark when upgrade is bought
changes shopping cart to green checkmark when upgrade is bought