style.css

*{
    margin:0;
    padding: 0;
}
body{
    background: #12c2e9;  /* fallback for old browsers */
    background: -webkit-linear-gradient(to right, #f64f59, #c471ed, #12c2e9);  /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to right, #f64f59, #c471ed, #12c2e9); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
    
}
h1 {
    padding-top: 10px;
    font-size: 72px;
    background: -webkit-linear-gradient(rgb(150, 180, 180), rgb(0, 0, 0));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    border-bottom: 3px solid rgba(0, 68, 255, 0.753);
    width: fit-content;
    position: relative;
    margin-right: auto;
    margin-left: auto;
  }
table#main{
    position: relative;
    padding-left: 50px;
    width:30vw;
    height:35vw;
    position: relative;
    margin-top: 50px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 10px;
    align-items: center;
    border: dashed 5px rgb(0, 255, 170);
    padding: 1%;
    box-shadow: inset -3px -3px 23px 3px rgba(0,0,0,0.75);
}
td img{
    border-radius: 50%;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    -ms-border-radius: 50%;
    -o-border-radius: 50%;
}
input.btn{
    position: relative;
    display: inline-block;
    font-size: 1.8em;
    margin-left: 42%;
}