.welcome {
    margin: 0 5%;
    padding: 50px;
    margin-top: 50px;
    background-color: #f9f9ff;
    box-shadow: rgba(50, 50, 93, 0.25) 0px 6px 12px -2px, rgba(0, 0, 0, 0.3) 0px 3px 7px -3px;
}

.principal {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    align-self: center;
}
.princ{
    text-align: justify;
}

@media only screen and (max-width: 900px) {
    .welcome {
        display: block;
        padding: 5%;

    }

    .princ {
        width: 100%;
        margin-bottom: 30px;
    }
}