body {
    background: url(https://html5book.ru/wp-content/uploads/2015/07/background39.png);
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.floating-button {
    text-decoration: none;
    display: inline-block;
    width: 140px;
    height: 45px;
    line-height: 45px;
    border-radius: 45px;
    margin: 10px 20px;
    font-family: "Montserrat", sans-serif;
    font-size: 16px;
    text-transform: uppercase;
    text-align: center;
    letter-spacing: 3px;
    font-weight: 600;
    color: #524f4e;
    background: white;
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
    transition: 0.3s;
}

.floating-button:hover {
    background: #2ee59d;
    box-shadow: 0 15px 20px rgba(46, 229, 157, 0.4);
    color: white;
    transform: translateY(-7px);
}

#first {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2;
}

#message {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 55vh;
    height: 55vh;
    position: relative;
}

.text-container {
    display: flex;
    flex-grow: 1;
    align-items: center;
    justify-content: center;
    width: 100%;
    box-sizing: border-box;
}

#closeButton {
    position: absolute;
    bottom: 10%;
    width: 80%;
    left: 50%;
    transform: translateX(-50%);
}