style.css

*{
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;

}

.header{
    height: 100px;
    background-color: #34495e;
    padding: 0 20px;
    color: #fff;
    /* position: fixed;
    width: 100%;
    top: 0;
    right:0; */
    
}
.logo{
    line-height: 100px;
    float: left;
    margin-left: 40px;
    text-transform: uppercase;

}

.menu{
    float: right;
    line-height: 100px;
}
.menu a{
    color:#fff;
    text-transform: uppercase;
    text-decoration: none;
    padding: 0 10px;
    transition: 0.4s;
}
.show-menu-btn,.hide-menu-btn{
    transition: 0.4s;
    font-size: 30px;
    cursor: pointer;
    display: none;
}
.show-menu-btn{
    float: right;
}
.show-menu-btn i{
    line-height: 100px;
}

.menu a:hover,
.show-menu-btn,
.hide-menu-btn{
    color: #3498db;

}
#chk{
    position: absolute;
    visibility: hidden;
    z-index: -1111;
}

.content{
    padding: 0 20px;
}
.content img{
    width: 100%;
    max-width: 700px;
    margin: 20px 0;
    
}
.content p{
    text-align: justify;
}

@media screen and (max-width:800px){
    .show-menu-btn,.hide-menu-btn{
        display: block;
    }
    .menu{
        position: fixed;
        width: 30%;
        height: 100vh;
        background: #333;
        right:-100%;
        top: 0;
        text-align: center;
        padding:80px 0;
        line-height: normal;
        transition: 0.7s;
    }
    .menu a{
        display: block;
        padding:20px;
    }
    .hide-menu-btn{
        position: absolute;
        top: 40px;
        right: 40px;
    }
    #chk:checked ~ .menu{
        right:0;
    }
}