style.css

:root {
    --icon-size: 32px;
    --primary-color: #0070ba;
    --primary-color: #055fd5;
}

/* Layout */
* {
    box-sizing: border-box;
}

html {
    height: 100%;
    touch-action: manipulation;
}

html,
body {
    margin: 0;
    display: flex;
    flex-direction: column;
    width: 100%;
    overflow-x: hidden;
    background: #efefef;
    /*background: #009cde;*/
    /*background-image: radial-gradient(circle farthest-side at center bottom, #009cde, #003087 125%)*/
}

body {
    flex-grow: 1;
    align-items: center;
    justify-content: center;
    overflow-y: hidden;
}

.row-reverse {
    display: flex;
    flex-direction: row-reverse;
    width: 100%;
}

.row {
    display: flex;
    flex-direction: row;
    align-items: center;
}

.column {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.center {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.full {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.grow {
    flex-grow: 1;
    width: 100%;
}

.grow.column {
    width: 100%;
}


header {
    background: white;
    color: #333;
    /*background: #232323;*/
    /*color: white;*/
    --icon-size: 40px;
    z-index: 2;
}

header,
footer {
    width: 100%;
    min-height: 56px;
    align-items: center;
    padding: 0 24px;
    /*color: white;*/
}

main {
    flex-grow: 1;
}

[hidden] {
    display: none !important;
}


/* Typography */

body {
    font-family: -apple-system, BlinkMacSystemFont, Roboto, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    color: #333;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1 {
    font-size: 30px;
    font-weight: 400;
    letter-spacing: -.01em;
    /*line-height: 40px;*/
    line-height: 32px;
    margin: 0;
}

h2 {
    font-size: 24px;
    font-weight: 400;
    letter-spacing: -.012em;
    line-height: 32px;
}

h3,
.font-h3 {
    font-size: 18px;
    font-weight: 500;
    margin: 16px 0;
}

h1+h3 {
    margin: 16px 0 40px;
    font-weight: 400;
}

.font-subheading {
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

.font-body1,
body {
    font-size: 14px;
    font-weight: 400;
    line-height: 20px;
}

.font-body2 {
    font-size: 12px;
    line-height: 18px;
}

a {
    text-decoration: none;
    color: currentColor;
    cursor: pointer;
}

.font-button,
.button {
    line-height: 24px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    white-space: nowrap;
    opacity: 0.8;

}


.font-code{
    font-family: monospace;
}


/* Icons */

.icon {
    width: var(--icon-size);
    height: var(--icon-size);
    fill: currentColor;
    border-radius: 50%;
}

.icon.size-2 {
    --icon-size: 48px;
}

.icon-button {
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
    touch-action: manipulation;
    width: 48px;
    height: 48px;
    --icon-size: 24px;
    outline: none;
}

.icon-button:before {
    border-radius: 50%;
}


.button,
.icon-button {
    cursor: pointer;
    touch-action: manipulation;
    position: relative;
}

.button:before,
.icon-button:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: currentColor;
    opacity: 0;
    transition: opacity 300ms;
}

.button:hover:before,
.icon-button:hover:before {
    opacity: 0.1;
}

.button:focus:before,
.icon-button:focus:before {
    opacity: 0.2;
}

/* Button */
.button {
    background: none;
    border: none;
    outline: none;
    position: relative;
    min-height: 48px;
    border-radius: 64px;
    overflow: hidden;
    /*margin: 8px 0;*/
    width: 100%;
    line-height: 48px;
    display: flex;
    justify-content: center;
    padding: 0 24px;
}

.button.outlined {
    border: 3px solid var(--primary-color);
    color: var(--primary-color);
}

.button.outlined:hover {
    background: var(--primary-color);
    color: white;
}

.button.default {
    background-color: var(--primary-color);
    color: white;
}

/* Shadows */

.shadow-1 {
    box-shadow: 0 3px 4px 0 rgba(0, 0, 0, 0.14),
        0 1px 8px 0 rgba(0, 0, 0, 0.12),
        0 3px 3px -2px rgba(0, 0, 0, 0.4);
}

.shadow-2 {
    box-shadow: 0 4px 5px 0 rgba(0, 0, 0, 0.14),
        0 1px 10px 0 rgba(0, 0, 0, 0.12),
        0 2px 4px -1px rgba(0, 0, 0, 0.4);
}



/* Text Input */

.input {
    width: 100%;
    border: none;
    outline: none;
    padding: 16px 24px;
    background: #f1f3f4;
    border-radius: 4px;
    margin: 8px 0;
    line-height: 16px;
    font-size: 14px;
    border-bottom: 3px solid transparent;
}

.input:hover {
    background: rgba(0, 0, 0, 0.07);
}

.input:focus {
    background: rgba(0, 0, 0, 0.10);
    border-bottom: 3px solid #458dc8;
}

/* Pages */

section {
    padding: 48px 16px 40px;
    width: 100%;
    height: 100%;

    border-radius: 4px;
    background: white;
}

section h1 {
    color: var(--primary-color);
}

/* Router */
section {
    display: flex;
}

/*
section:not(:target),
section:target~section[default] {
    display: none;
}

section[default] {
    display: flex;
}*/



/* Responsiveness */
@media (max-width: 620px),
(max-height: 600px) {
    body {
        background-image: #efefef;
        overflow-y: auto;
    }

    header {
        box-shadow: 0 3px 4px 0 rgba(0, 0, 0, 0.14),
            0 1px 8px 0 rgba(0, 0, 0, 0.12),
            0 3px 3px -2px rgba(0, 0, 0, 0.4);
        z-index: 1;
        padding: 0 16px;
    }

    h1 {
        font-size: 24px;
    }

    h1+h3 {
        font-size: 16px;
        margin-top: 4px;
        margin-bottom: 16px;
    }

    section {
        max-height: 100%;
        border-radius: 0;
        box-shadow: none !important;
        padding: 32px 8px 16px;
        flex-grow: 1;
    }

    footer {
        height: 32px;
        background: white;
    }

    section {
        position: initial;
    }
}

.margin-1 {
    margin-bottom: 16px;
}

.margin-2 {
    margin-bottom: 24px;
}

.margin-3 {
    margin-bottom: 32px;
}

.margin-right-1 {
    margin-right: 16px;
}

.margin-right-2 {
    margin-right: 24px;
}


.logo {
    font-weight: 700;
    opacity: 0.9;
    font-size: 22px;
    letter-spacing: 0.1em;
}