change float to flex layout

looper3339

2019-05-25 5b38785b33b06d877101ef639ca5d5e675c85b4d

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.passwordbox-open {
  background: url('images/passwordbox_open.png') no-repeat center center;
}
.passwordbox-close {
  background: url('images/passwordbox_close.png') no-repeat center center;
}