let heightStr = '56.54px';
let number = parseFloat(heightStr.replace('px', ''));
console.log(number)
// or on a DOM Element
const message = document.querySelector('.message-container');
console.log(getComputedStyle(message).height);
message.style.height =
Number.parseFloat(getComputedStyle(message).height, 10) + 22.5 + 'px';
