index.css

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: "Roboto", sans-serif;
}

html,
body {
    background: #1d3354 center center no-repeat;
    opacity: 0.879;
    background-size: cover;
    display: flex;
    overflow: hidden;
    color: black;
    height: 100%;
    width: 100%;
    scroll-behavior: smooth;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    justify-content: center;
    padding-top: 20px;
    height: 100%;
    width: 100%;
}

button {
    text-transform: uppercase;
    color: white;
    padding: 7px 10px;
    border-radius: 50px;
    border: 2.5px solid white;
    font-size: 18px;
    font-weight: bold;
    background: transparent;
    transition: 0.4s ease-in-out;
    margin: 50px 5px;
}

button:hover {
    background: white;
    cursor: pointer;
    color: black;
}

a {
    text-decoration: none;
    color: inherit;
}

p {
    color: #9ed8db;
    font-size: xx-large;
}

#logo {
    margin-bottom: 15px;
    padding: 20px;
    width: 600px;
    height: 390px;
}