body{
    font-family: 'Times New Roman', Times, serif;
    font-size: 20px;
    list-style: none;
    /* background-image: linear-gradient(white); */
    margin: 0;
    /* opacity: 0.7; */
    /* background-color: rgba(173, 216, 230,0.3); */
    /* background-color: black; */
    
}
/* .sidebar{
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    background-color: red;
    color: white ;
} */
nav{
    position: sticky;
    margin: 0px;
    padding-top: 20px;
    background-color: black;
    display: flex;
    height: 60px;

    .logo{
        margin-left: 20px;
        width: 80%;
    }
    .navbar{
        width: 120%;
    }
}
.navbar ul{
    display: flex;
    justify-content: space-around;
    text-align: end;
}
.navbar ul a{
    color: rgba(255, 255, 255, 0.674);
    text-decoration: none;
    font-size: 20px;
}
.navbar ul a:hover{
    color: white;
    text-decoration: underline;
}
.title{
    /* background-color: black; */
    background-color: black;
    display: flex;
    height: 20vh;
    justify-content: center;
    align-items: center;
    margin-bottom: 5px;
}
.maintopic{
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: -5px;
    /* background-image: ; */
    background-image:url("developer-8829711_1920.jpg") ;
    height: 80vh;
}
.chapters{
    border:5px solid black;
    display: flex;
    background-color: white;
    flex-direction: column;
    align-items:flex-start
    
    width: 50%;
    /* height: 70vh; */
    border-radius: 10px;
    opacity: 0.5;
}
.chapters:hover{
    border-left: 15px solid black;
    border-right: 15px solid black;
}
.chapters h2{
    color: black;
}

.title h1{
    color: white;
}
.sme{
    display: none;
    /* transition-duration: 3s; */
    /* display: block; */

}
.sme:hover{
    display: block;
}
.ch{
    display: flex;
    justify-content: center;
    background-color: lightgreen;
    margin-bottom: 50px;
    /* color: black; */
}
.ch h1{
    color: black;
}
.mnotes{
    display: flex;
    justify-content: center;
    align-items: center;
    /* background-image:url(../images/front-view-man-looking-away.jpg) ; */
    background-position: center;
    background-repeat: no-repeat;
}
.notes{
    display: flex;
    flex-direction: column;
    /* justify-content: center; */
    width: 50%;
    padding: 30px;
    border-radius: 15px;
    border: 7px solid black;
    /* height: 70vh; */
    background-color: greenyellow;
    z-index: 900;
}
.subtopic{
    display: flex;
    justify-content: center;
}
.notes ul li{
    line-height:2em;
}
.space{
    height: 20vh;
    background-color: white;
}
.notes p{
    font-weight: 500;
    font-size: 18px;
}
.notes ul li{
    font-weight: 400;
    font-size: 18px;
}
footer{
    position: relative;
    color: aliceblue;
    margin-top: 20px;
    background-color: black;
    height: 300px;
}
.phone img{
    position: absolute;
    top: 60px;
    right: 700px;
    height: 30px;
}
.footer{
    display: flex;
    justify-content: space-around;
}
.footer ul{
    display: flex;
    flex-direction: column;
    text-align: left;
}
.footer li{
    padding-top: 10px;
    list-style-type: none;
}
.footer a{
    color: aliceblue;
    text-decoration: underline;
}
span{display: flex;
    justify-content: center;

}
span img{
    height: 40px;
    padding-top: 20px;
    padding-left: 25px;
}