Selectors are directly exacted from:

webapp cn ltr.css

with JavaScript:

const otherStyle = '.sl-sugg-button-container > .jfk-button { border-radius: 0 !important; }'

fetch( new Request('webapp_cn_ltr.css') )
.then(
  response => response.text()
).then(
  text => {
    console.log(text);
    document.body.textContent = text.split("}")
    .filter(
      str => /border-radius:[^012]px/.test(str)
    ).map(
      str => str.split("{")[0]
    ).join(",\n") + " { border-radius: 2px !important; }\n" + otherStyle
  }
);