editor.js/src/styles/input.css

.cdx-search-field {
  --icon-margin-right: 10px;

  background: rgba(232,232,235,0.49);
  border: 1px solid rgba(226,226,229,0.20);
  border-radius: 6px;
  padding: 2px;
  display: grid;
  grid-template-columns: auto auto 1fr;
  grid-template-rows: auto;

  &__icon {
    width: var(--toolbox-buttons-size);
    height: var(--toolbox-buttons-size);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--icon-margin-right);

    svg {
      width: var(--icon-size);
      height: var(--icon-size);
      color: var(--grayText);
    }
  }


  &__input {
    font-size: 14px;
    outline: none;
    font-weight: 500;
    font-family: inherit;
    border: 0;
    background: transparent;
    margin: 0;
    padding: 0;
    line-height: 22px;
    min-width: calc(100% - var(--toolbox-buttons-size) - var(--icon-margin-right));

    &::placeholder {
       color: var(--grayText);
       font-weight: 500;
    }
  }
}