@import url(http://fonts.googleapis.com/css?family=Roboto:400,100);
.button_login{
    color: #fff;
    background-color: #5cb85c;
    border-color: #4cae4c;
    padding: 3px 3px;
    font-size: 15px;
    line-height: 1.33;
    border-radius: 6px;
}
a:hover{
    text-decoration: none;
    color: red;
}

/*Ipad ngang(1024 x 768)*/
@media screen and (max-width: 1024px){
    #logoheader{
        width: 75%;
        float: left;
    }
    #logoheader >img{
        width: 100%;
    }
    #loginheader{
        width: 25%;
    }
    .button_login{
        padding: 3px 3px;
        font-size: 15px;
        line-height: 1.33;
        border-radius: 6px;
    }
}
/*Ipad dọc(768 x 1024)*/

@media screen and (max-width: 880px){
    #logoheader{
        width: 100%;
        float: none;
    }
    #logoheader >img{
        width: 100%;
    }
    #loginheader{
        width: 100%;
        margin-left: 0px;
    }
    .button_login{
        padding: 3px 3px;
        font-size: 15px;
        line-height: 1.33;
        border-radius: 6px;
    }
}
/*Tablet nhỏ(480 x 640)*/
@media screen and (max-width: 480px){
    #logoheader{
        width: 100%;
        float: none;
    }
    #logoheader >img{
        width: 100%;
    }
    #loginheader{
        width: 100%;
        margin-left: 0px;
    }
    .button_login{
        padding: 3px 3px;
        font-size: 12px;
        line-height: 1.13;
        border-radius: 1px;
    }
}
/*Iphone(480 x 640)*/
@media screen and (max-width: 320px){
    #logoheader{
        width: 100%;
        float: none;
    }
    #logoheader >img{
        width: 100%;
    }
    #loginheader{
        width: 100%;
        margin-left: 0px;
    }
    .button_login{
        padding: 2px 2px;
        font-size: 8px;
        line-height: 1.13;
        border-radius: 1px;
    }
}
/*Smart phone nhỏ*/
@media screen and (max-width: 240px){
    #logoheader{
        width: 100%;
        float: none;
    }
    #logoheader >img{
        width: 100%;
    }
    #loginheader{
        width: 100%;
        margin-left: 0px;
    }
    .button_login{
        padding: 2px 2px;
        font-size: 8px;
        line-height: 1.13;
        border-radius: 1px;
    }
}