.article_search_form {
  width:100%;
  max-width: 479px;
  margin:auto;
  position: relative;
  overflow:  hidden;
}

.article_search_form input[type="text"] {
  text-indent: 1.5em;
  border-radius: 45px 0 0 45px;
  width: calc( 100% - 122px )!important;
  float: left;
}

.article_search_form input,
.article_search_form input:hover {
  height: 45px!important;
  line-height: 45px!important;
  border: 0;
}

.article_search_form input[type="submit"] {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box; 
  box-sizing: border-box;
  text-transform: uppercase!important;
  border-radius: 0 45px 45px 0;
  float:  right;
  width:  122px;
}

@media( max-width: 600px ){

}