style.css

#main {
    width: 500px;
    height: 500px;
    display: flex;
    flex-direction: column;
    justify-content: start;
    margin:200px auto;
}

#logo {
    width: 100px;
}

body {
    background: linear-gradient(to left top, #BF919C, #544C85) fixed;
    background-size: cover;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

h1 {
    font-size: 3.5em;
    margin: 10px 0px;
    color: white;
}

p { 
    color: #FFFFFFA0;
    font-size: 18px;
}

a > button {
    display:inline-block;
    padding:0.3em 1.2em;
    margin:0 0.1em 0.1em 0;
    border:0.16em solid rgba(255,255,255,0);
    backcground-color: #9a4ef1;
    border-radius:2em;
    box-sizing: border-box;
    text-decoration:none;
    font-family:'Roboto',sans-serif;
    font-weight:300;
    color:#FFFFFF;
    text-shadow: 0 0.04em 0.04em rgba(0,0,0,0.35);
    text-align:center;
    transition: all 0.2s;
    color: black
}
a > button:hover {
    border-color: rgba(255,255,255,1);
    cursor: pointer;
}

@media all and (max-width:30em) {
    a > button {
        display:block;
        margin:0.2em auto;
    }
}