#copia {
    background-color: #f0f0f0;
    border: 1px solid #ddd;
    color: #333;
    padding: 8px 12px;
    font-size: 10px;
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    margin-right: 10px;
    height: 23px;
}
#copia:hover {
    background-color: #ddd;
}
#copia:active {
    background-color: #ccc;
}

body {
   font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.container {
    width: 100%;
    height: 100vh;
    position: relative;
    overflow: hidden;    
}

#divisore {
    width: 5px;
    height: 100%;
    background-color:#E14B23;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    cursor: ew-resize;
    z-index: 1;/* In altre parole, l'elemento con z-index: 1; sarà sovrapposto solo dagli elementi con un valore di z-index superiore*/

}

#divisore2 {
    width: 100%;
    height: 5px;
    background-color:#F1B51C;
    position: absolute;
    top: 50%;
    cursor: ns-resize;
    z-index: 1;
}

#page1, #page2 {
    width: calc(50% - 2.5px);
    height: 100%;
    position: absolute;
    top: 0;
    overflow-y: scroll;
    box-sizing: border-box;
    padding: 30px;
}

#page1 {
    left: 0;
}

#page2 {
    right: 0;
    background-color: #dddddd;
}


#pag21 {
    top: 0;
}

#pag21, #pag22 {
    width: calc(100% - 100px); /* Sottrai la larghezza del margine destro */
    height: 40%;
    position: absolute;
    overflow-y: auto;
    box-sizing: border-box;
    background-color: #f0f0f0; 
    border-radius: 20px; 
    padding: 10px; 
    margin-bottom: 20px; 
    margin-top: 20px; 
    margin-right: 40px; 
    margin-left: 40px; 
}

#pag22 {
    bottom: 0;
}