transform 중앙 정렬 시
.middle {
position: absolute;
top: 50%;
left: 50%;
min-width: 390px;
-webkit-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}
해결 방안
transform: translateY(-50%) translateX(-50.1%);
https://bugs.chromium.org/p/chromium/issues/detail?id=483381