html{
    background-color:antiquewhite;
}
div{
    padding: 5px;
    margin:  15px;
    width : 98%;
    height: 25%;
    background: #0b909b;
    border-radius: 15px;
    border-style: solid;
    border-color: black;
}
h1{
    color: #8df0c6;
}
#t4{
    text-align: center;
    font-size: 50px;
    color: black;
}
a{
    text-decoration:none;
    font-size: 20px;
    color: black;
    padding: 5px;
    width: 150px;
    border-style: solid;
    border-color: black;
    border-radius: 15px;
    background-color:cornflowerblue;
}
a:hover{
    background-color: #91f5cf;
}