display backdrop when user focus input

[AlonsoK28]

display backdrop may improve user UX

this options is already available into jQuery Typeahead http://www.runningcoder.org/jquerytypeahead/documentation/

example

// Custom light blue backdrop
backdrop: {
    "opacity": 0.15,
    "filter": "alpha(opacity=15)",
    "background-color": "#eaf3ff"
}

with backdrop enabled

without backdrop

[AlonsoK28]

This could be done using CSS styles like this

.tt-list {
  border-color: #ccc !important;
  // dropdown shadow example https: //codepen.io/connexo/pen/gmWjNJ
  box-shadow: 0 5px 13px #999;
}

[niketpathak]

Hello, the basic styles do not include any shadows by default as websites using a dark/light color theme would require their own customization. Hence its better that the end-user gets to decide what shadows are to be used.