.github-corner:hover .octo-arm {
    animation: octocat-wave 560ms ease-in-out;
}

@keyframes octocat-wave {
    0%, 100% {
        transform: rotate(0);
    }

    20%, 60% {
        transform: rotate(-25deg);
    }

    40%, 80% {
        transform: rotate(10deg);
    }
}

@media (max-width: 500px) {
    .github-corner:hover .octo-arm {
        animation: none;
    }

    .github-corner .octo-arm {
        animation: octocat-wave 560ms ease-in-out;
    }
}

html {
    font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI" ,Roboto, "Helvetica Neue", Arial, sans-serif;
}

html, body, .app {
    height: auto;
}

.app {
    margin: 20px 100px 50px 100px;
}

body {
    background-color: #f7f7f7;
}

.header {
    text-align: center;
    margin-bottom: 15px;
    font-size: 30px;
    font-weight: bold;
    color: #287acc;
}

.textarea {
    width: 100%;
    font-size: 16px;
    height: 150px;
    border-radius: 3px;
    padding: 10px;
    box-sizing: border-box;
    border: none;
    background-color: #4da6ff;
    color: #fff;
}

textarea {
    width: 100%;
    font-size: 16px;
    height: 150px;
    border-radius: 3px;
    padding: 10px;
    box-sizing: border-box;
    border: none;
    resize: none;
    font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI" ,Roboto, "Helvetica Neue", Arial, sans-serif;
}

textarea:not(.readonly):focus {
    outline: none;
    box-shadow: 0 0 0 2px #3399ff;
}

textarea.readonly {
    background-color: #4da6ff;
    color: #fff;
}

textarea.readonly:focus {
    outline: none;
}

.title {
    text-align: center;
    color: #3399ff;
}

.title.install {
    margin-top: 20px;
}

.title:not(.install) {
    margin: 20px 0;
}

.img-container {
    text-align: center;
}

.flex-container {
    display: flex;
    align-items: center;
}

.flex-item-sm {
    flex-grow: 1;
    flex-basis: 0;
}

.flex-item-lg {
    flex-grow: 10;
    flex-basis: 0;
}

.textarea-container:not(:last-child) .textarea {
    margin-bottom: 3px;
}

.blue-bar {
    height: 10px;
    background-color: #3399ff;
}

.blue-bar:not(:last-child) {
    margin-bottom: 30px;
}

.crossed {
    text-decoration: line-through;
}

.placeholder {
    color: #777777;
}

.more {
    margin-top: 20px;
    text-align: center;
}

.more .dot-container {
    cursor: pointer;
    display: inline-block;
    width: 100px;
}

.more .dot-container .dot {
    display: inline-block;
    background-color: #4da6ff;
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.more .dot-container:hover .dot {
    animation: strong-color 560ms ease-in-out forwards;
}

@keyframes strong-color {
    0% {
        background-color: #4da6ff;
    }

    50% {
        background-color: #3399ff;
    }

    100% {
        background-color: #1a8cff;
    }
}

::placeholder {
    /* Chrome, Firefox, Opera, Safari 10.1+ */
    color: #777777;
    opacity: 1;
    /* Firefox */
}

:-ms-input-placeholder {
    /* Internet Explorer 10-11 */
    color: #777777;
}

::-ms-input-placeholder {
    /* Microsoft Edge */
    color: #777777;
}