html, body {
    background-color: #E3E3E3;
    height: 100%;
    margin: 0;
    padding: 0;  
}

table#scoresheet {
    table-layout: fixed;
    border-collapse: collapse;
    text-align: center;
    width: 100%;
    height: 100%;
}

th, td {
    border: 1px solid black;
    margin: 10px;
}

th button {
    margin-left: 5px;
}

a {
    text-decoration: none;
    color: royalblue;
}

th input[type="text"], td input[type="text"], td input[type="number"] {
    box-sizing: border-box;
    text-align: center;
    min-width: 10%;
    max-width: 100%;
    width: 100%;
    height: 100%;
}

#rules_text {
    background: white;
    display: none;
    position: absolute;
    top: 5%;
    left: 5%;
    right: 5%;
    top: 2.5%;
    bottom: 2.5%;
    height: 92.5%;
    width: 90%;
    z-index: 1;
    padding: 0px 10px;
    border: 2px solid black;
    overflow: auto;
}

iframe {
    position: relative;
    height: 100%;
    width: 100%; 
}

#close_rules {
    position: absolute;
    top: 30px;
    right: 30px;
    cursor: pointer;
    font-weight: bold;
}

h1 {
    text-align: center;
    text-decoration: underline;
}