body {
    background-color: #1e1e1e;
    color: #3799d3;
    font-family: 'Arial', Courier, monospace;
}

.ctf-col {
    min-width: 160px;
}

.chal-btn {
    font-weight: bold;
    font-size: 1.2rem;
    height: 70px;
    background-color: #161b22;
    border-color: #2ea043;
    color: #2ea043;
}

.chal-btn:hover {
    background-color: #2ea043;
    color: #ffffff;
}

.form-control:focus {
    border-color: #2ea043;
}