You need comment below code in ionic.css
.platform-android .action-sheet-backdrop.active {
background-color: rgba(0, 0, 0, 0.2); }
.platform-android .action-sheet {
margin: 0; }
.platform-android .action-sheet .action-sheet-title,
.platform-android .action-sheet .button {
text-align: left;
border-color: transparent;
font-size: 16px;
color: inherit; }
.platform-android .action-sheet .action-sheet-title {
font-size: 14px;
padding: 16px;
color: #666; }
.platform-android .action-sheet .button.active,
.platform-android .action-sheet .button.activated {
background: #e8e8e8; }
.platform-android .action-sheet-group {
margin: 0;
border-radius: 0;
background-color: #fafafa; }
.platform-android .action-sheet-cancel {
display: none; }
.platform-android .action-sheet-has-icons .button {
padding-left: 56px; }
for more infomation go through with below link
https://forum.ionicframework.com/t/actionsheets-android-ugly-styling-need-help/18462