.btn-outline-primary {
    color: rgb(40, 109, 149);
    border-color: rgb(40, 109, 149);
    transition: all 0.3s ease;
}
.btn-outline-primary:hover,
.btn-outline-primary.active,
.btn-outline-primary:active,
.btn-outline-primary:focus {
    background-color: rgb(40, 109, 149);
    color: #fff;
    border-color: rgb(40, 109, 149);
}
footer {
    padding: 30px;
    text-align: center;
    background-color: rgb(113, 132, 143);
    color: rgb(216, 229, 237);
}
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
main {
    flex: 1;
}