.sticky-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 300px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #efefef;
  height: 6rem;
  padding: 0 2rem;
}

.dialog {
  width: 400px;
  position: fixed;
}

.dialog input {
  width: 100%;
}

.dialog::backdrop {
  background-color: rgba(43, 46, 56, 0.9);
}

dialog::backdrop {
  background: red;
}