body{
    background-color: #a1a1a1;
}

.navigation{
    margin: -10px;
    position: fixed;
    background-color:black;
    width: 200px;
    height: 100%;
    float: inline-start;
    text-align: center;
    font-size: 40px;
    color: white;
}

.navigation ul{
    list-style-type: none;
}

.navigation li{
    margin-top: 40px;
}

.navigation a{
    color: white;
    font-family: serif;
}

.navigation a:hover{
    color: aqua;
}

.introduce{
    padding-top: 20px;
    margin-left: 10%;
    text-align: center;
}

.info{
    float: right;
    margin-left: 10%;
    width: 90%;
    text-align: center;
}

.info h1{
    margin-top: 90px;
    font-size: 40px;
    text-align: center;
}

.info p{
    margin-bottom: 30px;
    text-align: center;
}