#div_login{
    width: 30%;
    margin-left: 35%;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    border: 1px solid #808080;
    padding: 20px;
    border-radius: 10px;
    box-shadow: #333 0px 0px 10px;
}
#div_logo{
    display: flex;
    flex-direction: column;
    align-items: center;
}
#img_logo{
    width: 150px;
    height: auto;
}
#p_title{
    font-family: Arial, Helvetica, sans-serif;
    font-size: 32px;
    color: #333;
    margin-top: 10px;
}

.input_text{
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
    font-size: 16px;
}
#btn_login{
    width: 100%;
    padding: 10px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    margin: 10px 0 10px 0;
}

/* responsive design */
@media screen and (max-width: 768px) {
    #div_login{
        width: 90%;
        margin-left: 5%;
    }
}
@media screen and (max-width: 480px) {
    #div_login{
        width: 90%;
        margin-left: 5%;
    }
}