.box{
    width:300px;
   padding: 20px;
   background-color: cyan;
   border-radius: 20px;
   text-align: center;
   font-family: monospace;
   
}
body{
    display: flex;
    height: 100vh;
    align-items: center;
    justify-content: center;
    margin: 0;

}
button{

    color: chartreuse;
    background-color: black;
    width: 65px;
    height: 30px;
    border-radius: 15px;
}