header {

    width: 100%;

    background: #00008B;

}



#btn-menu {

    display: none;

}



header label {

    display: none;

    width: 30px;

    height: 30px;

    padding: 10px;

    border-right: 1px solid #fff;

    background-color: rgba(62,89,132,0.2);

}



    header label:hover {

        cursor: pointer;

        background: #00008B;

    }



.menu ul {

    margin: 0;

    list-style: none;

    padding: 0;

    display: flex;

}



.menu li {

    border-right: 1px solid #fff;

}



    .menu li:hover {

        background: #00008B;

    }



    .menu li a {

        display: block;

        padding: 3px 10px;

        color: #fff;

        text-decoration: none;

    }

input[type= "submit"] {

    background: linear-gradient(#4E94AB, #4E94AB);

    border: 0;

    color: white;

    opacity: 0.8;

    cursor: pointer;

    border-radius: 20px;

    margin-bottom: 0;

}



    input[type= "submit"]:hover {

        opacity: 1;

    }



    input[type= "submit"]:active {

        transform: perspective();

    }

@media (max-width:768px) {



    header label {

        display: block;

    }



    .menu {

        position: absolute;

        background: #00008B;

        width: 70%;

        margin-left: -70%;

        transition: all 1s;

    }



        .menu ul {

            flex-direction: column;

        }



        .menu li {

            border-top: 1px solid #fff;

        }



    #btn-menu:checked ~ .menu {

        margin: 0;

    }

}