#cusdis_thread {
    width: 30vw; /* nagyobb lett! */
    margin-left: calc(50vw + (22vw / 2)); /* 50% + a különbség fele */
    margin-top: 2rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: #f9f9f9;
    color: #000;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-sizing: border-box;
    clear: both;
    position: relative;
    z-index: 1;
}

/* Mobilbarát */
@media screen and (max-width: 768px) {
  #cusdis_thread {
    width: 95%;
    padding: 1rem;
    margin: 1.5rem auto;
  }
}