.links-container {
    display: flex;
    flex-direction: column;
    flex: 50px;
    justify-content: center;
    align-items: center;
    margin-bottom: auto;
    margin-top: 1fr;
}
.links {
    font-family: helvetica;
    justify-content: center;
    vertical-align: center;
    align-content: center;
    border: solid;
    text-align: center;
    margin: 10px auto 10px auto;
    width: 500px;
    border-color: #508AA8;
    border-width: 3px;
    padding: 15px 15px;
    color: #BA1200;
    font-weight: bolder;
    font-size: 30px;
    background-color: #9DD1F1;
    text-decoration: none;
    border-radius: 60px;
    transition: background-color 1s;
    transition: width .5s;
}
body {
    background-color: #031927;
}

.links:hover {
    background-color: #55beff;
    width: 540px;
}