*,
*::before,
*::after {
    box-sizing: border-box;
}



body {
    font-family: "Roboto", sans-serif;
    padding: 20px;
    text-align: center;
    width: 750px;
    margin: 0 auto;
    border-color: rgb(255, 0, 0);
    border: #6e78cc;
}


header {
    background-color: #6e78cc;
    color: #fff;
    padding: 20px;
    text-align: center;
    width: 750px;
    margin: 0 auto;
    
}

table {
    table-layout: fixed;
    width: 750px;
    border-collapse: collapse;
}

th,
td {
    width: 25%;
    text-align: center;
    vertical-align: middle;
    padding: 8px;
}

input[type="text"] {
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    text-align: center;
    font-size: 16px;
}

button {
padding: 8px 16px;
    font-size: 16px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: monospace;
}