body {
    overflow-y: scroll;
}

.navbar-brand {
    padding: 5px;
    margin-right: 50px;
}

.navbar-nav li {
    margin: 0 5px;
    font-size: medium;
}

.navbar-nav li:hover {
    background-color: rgb(230, 230, 230);
}

h1 {
    text-align: center;
    margin: 20px 0;
}

p {
    font-size: medium;
}

.img-bilibili {
    text-align: center;
}

.text-p p {
    margin: 25px 0;
}

.text-go {
    text-align: right;
}

.btn-danger {
    margin: 0 5px;
}

footer {
    background-color: purple;
    color: white;
    padding: 30px;
}

.red {
    background-color: red;
}

.green {
    background-color: green;
}

.footer-text-a {
    color: white;
}

.footer-text-a:hover {
    color: white;
}

.footer-text-a:visited {
    color: white;
}