html,
body {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    background-color: #0f0f0f;
    color: white;
    font-family: sans-serif;

    align-items: center;
    justify-content: center;
}

h1 {
    font-size: 70px;
}

.center {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 650px;

    background-color: #202020;
    border-radius: 20px;
    padding-bottom: 40px;
}

.row {
    display: flex;
    flex-direction: row;
    align-items: center;
    margin-bottom: 50px;
}

.margin-left {
    margin-left: 15px;
}

.margin-right {
    margin-right: 15px;
}

label {
    font-size: 20px;
}

button {
    background: none;
    display: flex;
    align-items: center;
    text-align: center;
    font-size: 20px;
    border: 2px solid #2ecc71;
    color: white;
    padding: 14px 20px;
    outline: none;
    opacity: 1;
    border-radius: 50px;
    transition: 0.25s;
    user-select: none;

    cursor: pointer;
}

button:hover {
    background: #2ecc71;
}

.file-upload {
    min-width: 200px;
    cursor: pointer;
}

.file-upload,
input,
select {
    background: none;
    border: 2px solid #3498db;

    border-radius: 50px;
    color: white;
    padding: 14px 20px;
}

select {
    cursor: pointer;
}

select option {
    margin: 10px;
    background: #202020;
    color: white;
    text-shadow: 0 1px 0 #0f0f0f;
}

.checkbox,
.remember {
    margin-left: 10px;
}

.green {
    color: #2ecc71;
}