nextcloud-server/core/css/publicshareauth.css

form fieldset {
	display: flex !important;
	flex-direction: column;
}

form fieldset > p {
	position: relative;
}

#password {
	margin: 5px 0;
	padding-right: 45px;
	height: 45px;
	box-sizing: border-box;
	flex: 1 1 auto;
	width: 100% !important;
	min-width: 0; /* FF hack for to override default value */
}

input[type='submit'],
input[type='submit'].icon-confirm {
	position: absolute;
	top: 0px;
	right: -5px;
	width: 45px !important;
	height: 45px;
	background-color: transparent !important;
}