about.css

body {
    margin: 0;
}
* {
    margin: 0;
    padding: 0;
    list-style-type: none;
    text-decoration: none;
    box-sizing: border-box;
}
nav {
    background: white;
    height: 80px;
    width: 100%;
    position: sticky;
    top: 0;
}
nav ul {
    float: right;
    margin-right: 20px;
}
nav ul li {
    line-height: 80px;
    display: inline-block; 
    margin: 0 5px;
}
nav ul li a {
    font-size: 17px;
    text-align:center ;
}
.home {
    padding: 10px 15px;
}
label.main-nav {
    padding: 0 100px;
    line-height: 80px;
    font-size: 35px;
}
.menu {
        width: 25px;
        height: 3px;
        margin: 6px 0;
        font-size: 30px;
        line-height: 80px;
        margin-right: 40px;
        cursor: pointer;
}
.right {
    margin-top: 15px;
    float: right;
    display: none;
}
#check {
    display: none ;
}
#check:checked ~ ul {
    left:0%;
}
p {
    text-align: center;
    margin-left: 20%;
    width: 60%;
    margin-bottom: 20px;
}
@media screen and (max-width: 767px){
body {
    background: silver;
}
    * {
        box-sizing: border-box;
    }
    nav {
        position: sticky;
        top: 0;
        margin: 0%;
    }
    nav ul {
        float: right;
        margin-right: 20px;
    }
    nav ul li {
        display: block; 
        margin: 50px;
        line-height: 30px;
    }
    nav ul li a {
        font-size: 20pxpx;
        color: white;
        text-align: center;
    }
    ul {
        position: fixed;
        width: 100%;
        height: 100vh;
        background: #2c3e50 ;
        top: 80px;
        left: -100%;
        text-align: center;
        transition: all .5s;
        opacity:80% ;
    }
    .home {
        background: none;
        padding: 10px 15px;
        color: violet;
    }
    label.main-nav {
        padding-left: 50px;
        color: white;
        font-size: 30px;
    }
    .right {
        display: block;
    }
    #check {
        display: none ;
    }
    #check:checked ~ ul {
        left: 0%;
    }
    p {
        width: 100%;
        margin: 0%;
    }
}