.header_sec {
    background-image: url(../img/1392x960finestre.jpg);
}
.frecciaDx,
.frecciaSx {
    width: 35px;
    height: 35px;
    position: absolute;
    background-color: var(--rosso);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50px;
    color: white;
    font-weight: 800;
}

.frecciaDx:hover,
.frecciaSx:hover {
    cursor: pointer;
}

.frecciaDx {
    right: 0;
}

.frecciaSx {
    left: 0;
}