style.css

 #container {
     display:flex;
     flex-direction: column;
 }

 * {
	margin: O;
	padding: 0;
}
body {
    min-height: 100vh;
    background-image: linear-gradient(to right, #4facfe 0%, #00f2f3 100%);
    font-family: roboto, sans serif;
}

.container {
    background: #fff;
    border-radius: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 40px;
    margin: auto;
    width: 50%;
    margin-top: 3em;
    box-shadow: 2px 2px 2px #888888;
}

.title {
    font-size: 55px;
    font-weight: 700;
    color: #a9a9a9;
    text-align: center;
    margin-bottom: 10%;
}

.quoteBtn {
    color: #fff;
    background: #00f2f3;
    outline: none;
    display: inline-block;
    text-align: center;
    justify-content: center;
    max-width: 50%;
    margin-top: auto;
    padding: 15px;
    font-size: 20px;
    font-weight: 600;
    border-radius: 25px;
    border: transparent;
    cursor: pointer;
}


.quoteDiv {
    background: #e9e9e9 ;
    margin: 20px 0;
    padding: 35px;
    border-radius: 5px;
}

.quoteTxt {
    text-align: center;
    font-size: 25px;
    font-style: italic;
    color: #5c5c5c;
}

.authorTxt {
    text-align: center;
    font-size: 25px;
    color: #d57eeb;
}