Change horizontal to vertical horientation

Hello I was preparing the pluging and the vertical horientation doesn’t work but I used this CSS code to solve it:

.bopobb-single-wrap .bopobb-items-top-wrap {
margin-top: 1em;
display: flex;
flex-wrap: nowrap;
flex-direction: column;
align-content: center;
justify-content: center;
align-items: center;
}
.bopobb-single-wrap:not(.bopobb-shortcode-wrap) .bopobb-items-top-wrap .bopobb-item-top {
width: 300px;
}