.search-block form {
  display: flex;
  flex-wrap: wrap;
  box-shadow: -4px -7px 16px rgba(255, 255, 255, 0.25), 4px 7px 12px rgba(0, 0, 0, 0.5);
}

.search-block form .form-item {
  width: calc(100% - var(--a-button-height-default));
  margin: 0;
}

@media (min-width: 75rem) {

  .search-block form .form-item {
    width: calc(100% - var(--a-button-height-big));
  }
}

.search-block form .button {
  flex-shrink: 0;
  margin: 0;
}