styles.css

body {
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    padding-top: 50px;
   
}

input[type=text], input[type=password] {
    width: 100%;
    padding: 12px 10px;
    margin: 8px 0;
    display: block;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;   
    
}

h2, h3, h4 {
    text-align: center;
}

.logo {
   width: 50%;
   display: block;
   margin-left: auto;
   margin-right: auto;
}

input[type=submit] {
    width: 100%;
    background-color: rgb(117, 158, 41);
    color: white;
    padding: 14px 20px;
    margin: 8px 0;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: medium;
}

i[class="material-icons"] {
    display: block;
    margin-left: auto;
    margin-right: auto;
    font-size: 50px;
}