nav{background-color: black;
color:white;
padding:10px;}

h1,ul,li{display: inline;}

ul{margin-left: 68%;}

li{color: gray;
cursor:pointer;
}

li:hover{
    color: white;
}

.ns{
    border-color: black;
    border-width: 3px;
    border-style: solid;
    display: inline-block;
}

.appti{
    text-align: center;
    margin-top: 20px;
}

.ns:hover{
    background-color: black;
    color: white;}

.praticeheader{
    background-color: black;
    color: white;
    margin-top: 30px;
    padding:10px ;
}

.nsp{display: inline-block;
border-color: black;
border-width: 3px;
border-style: solid;
text-align: center;}
.pratice{
    text-align: center;
    margin-top: 30px;
}

.testheader{
    background-color: black;
    color:white;
    margin-top: 20px;
    padding: 10px;
}

.nst{
    display: inline-block;
    border-color: black;
    color: white;
    border-width: 3px;
    border-style: solid;
}

.test{
    text-align: center;
    margin-top: 30px;
}