.section {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.section_container {
    position: relative;
    -webkit-animation: fadein 1s; /* Safari and Chrome */
    -moz-animation: fadein 1s; /* Firefox */
    -ms-animation: fadein 1s; /* Internet Explorer */
    -o-animation: fadein 1s; /* Opera */
    animation: fadein 1s;
}