.search_input input {
  border: 1px solid #32BEA2;
  width: 100%;
}

.search_input {
  display: block;
  margin: auto;
  width: 100%;
  position: relative;
}

@media (min-width:998px) {
  .search_input {
    width: 50%;
  }  
}

.search_input div.input {
  display: block;
}

.search_input .do_search {
  position: absolute;
  right: 1px;
  bottom: 1px;
}