body{
    word-wrap: break-word;
    overflow-wrap: break-word;   
}
.howto_img{
    margin: 0px auto;
}
.howto_img img{
    margin: 20px auto 0;
    display: block;
    width: 80%;
    background-color: #ffffff;
}
@media screen and (max-width: 640px) {
    .howto_img img{
        margin: 20px auto 0;
        display: block;
        width: 100%;
        background-color: #ffffff;
    }
}
ul li{
    list-style: none;
}

ul {
    padding-left: 0;
}