*{
    padding: 0;
    margin: 0;
}
html{
    font-size: 62.5%;
}

/*导航条*/


.glyphicon-home:before {
    content: "\e021";
}

.navdiv{
    width: 80%;
    height: auto;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.navdiv img{
    max-width: 50%;
    max-height: 50%;
}