html, body {
    min-height: 100vh;
}
html {
    scroll-behavior: smooth;
}

body {
    display: flex;
    flex-direction: column;
}

header {
    padding: 15px;
    background: #fff;
}
main {
    flex-grow: 1;
}

.portal {
    min-height: 100vh;
    background-position: center;
    background-size: cover;
}
.portal.lignius {
    background-image: url(../images/bg_03.jpg);
}
.portal.guidaedilizia {
    background-image: url(../images/bg_02.jpg);
}
.portal.inwento {
    background-image: url(../images/bg_01.jpg);
}
.portal.guidaedilizia > *,
.portal.lignius > * {
    min-width: 1600px;
}


.bubble-content {
    background: rgba(255,255,255,.8);
    border-radius: 50%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}
.bubble-content-small {
    width: 250px;
    height: 250px;
    padding: 15px;
}
.bubble-content-large {
    width: 700px;
    height: 700px;
    padding: 30px;
}
.inwento-content {
    padding: 15px;
    max-width: 500px;
    margin: auto;
    text-align: center;
}