style.css

body {
    padding: 0;
    margin: 0;
    background-color: #f5f7fa;
    font-family: Helvetica, Arial;
    font-size: 1.2rem;
    letter-spacing: 0.5px;
    color: rgba(47, 40, 40, 0.87);
}

header {
    text-align: center;
    padding: 10px;
    border-bottom: 2px solid #59BF9A;
    background-color: white;
}

section {
    padding-top: 50px;
    padding-left: 2%;
    padding-right: 2%;
    padding-bottom: 10px;
}

.footer {
    display: none;
    margin-left: 2%;
    margin-right: 2%;
    margin-bottom: 2%;
    padding-top: 5px;
    padding-bottom: 5px;
    padding-left: 20px;
    padding-right: 20px;
    background-color: white;
    border: 2px solid #eeeeee;
    border-radius: 5px;
}

form {
    background-color: white;
    border: 2px solid #eeeeee;
    padding: 20px;
    border-radius: 5px;
}

div.field {
    margin-bottom: 20px;
}

div.field:last-child {
    margin-bottom: 0;
}

div.field > label {
    display: block;
    margin-bottom: 5px;
}

div.field > input[type=text], div.field > input[type=password] {
    padding: 10px;
    font-size: 1rem;
    width: 90%;
    border: 2px solid silver;
    border-radius: 5px;
    color: rgb(39, 31, 31);
}

div.field > input[type=text]:focus, div.field > input[type=password]:focus {
    border: 2px solid gray;
    outline: none;
}

button {
    font-size: 1.2rem;
    background-color: #185D71;
    padding: 10px;
    width: 250px;
    color: white;
    border: 1px solid white;
    border-radius: 5px;
}

.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto; /* 15% from the top and centered */
    padding: 20px;
    border: 1px solid #888;
    width: 80%; /* Could be more or less, depending on screen size */
}

/* The Close Button */
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}