*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.principal_block{
    padding: 30px;
    margin: auto ;
    display: block;
    width: 80%;
    text-align: justify;
    text-justify: inter-word;
}
@media all and (max-width:768px){
    .principal_block h2{
        font-size: 18px;
        
    }
    .principal_block h5{
        font-size: 15px;
        
    }

}