.certificate_img{
    width: 90%;
    border:#005778 1px solid;
    margin-top: 20px;
}
ul {
    list-style-type: none;
}
.certificate_text{
    font-size: 16px;
    background-color: #17539c;
    padding: 20px 10px;
    color: #ffff;
    margin-top: 0px;
    margin-bottom: 50px;
}

.cer_box{
    border: #17539c 1px solid;
}
/******************************************** (min-width: 320px) and (max-width:1000px) *******************************************/
@media only screen and (min-width: 320px) and (max-width:480px)
{
    .certificate_img{
        width: 70%;
        text-align: center;
        margin-top: 20px;
    }
}
/******************************************** (min-width: 320px) and (max-width:1000px) *******************************************/
@media only screen and (min-width: 480px) and (max-width:768px)
{
    .certificate_img{
        width: 90%;
        text-align: center;
        margin-top: 20px;
    }
}
/******************************************** (min-width: 320px) and (max-width:1000px) *******************************************/
@media only screen and (min-width: 768px) and (max-width:1023px)
{
    .certificate_img{
        width: 75%;
        text-align: center;
        margin-top: 20px;
    }
}