.header {
    display: flex;
    justify-content: center;
    align-items: center;
}


@media (prefers-color-scheme: light) {

  .headerbutton {
    color: black;
    border: none;
    border-radius: 8px;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    display: flex;
    font-size: 16px;
    margin: 4px 2px;
    padding-left: 0.3cm;
    padding-right: 0.3cm;
    cursor: pointer;
    height: 35px;
    transition-duration: 0.2s;
  }

  .headerbutton:hover {
    background-color: #EBEBEB;
  }

  .topbar {
    position: fixed;
    width: 100%;
    top: 0px;
    left: 0px;
    background-color: rgba(255, 255, 255, 1);
    border: 1px solid rgba(224, 224, 224, 1);
    color: #000000;
    z-index: 10;
  }

}

@media (prefers-color-scheme: dark) {

  .headerbutton {
    color: #ffffff;
    border: none;
    border-radius: 8px;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    display: flex;
    font-size: 16px;
    margin: 4px 2px;
    padding-left: 0.3cm;
    padding-right: 0.3cm;
    cursor: pointer;
    height: 35px;
    transition-duration: 0.2s;
  }

  .headerbutton:hover {
    background-color: #4a4a4a;
  }

  .topbar {
    position: fixed;
    width: 100%;
    top: 0px;
    left: 0px;
    background-color: #303030;
    border: 1px solid #1f1f1f;
    color: #ffffff;
    z-index: 10;
  }
}