.section {
    overflow-y: auto;
    width: 100%;
    height: 400px;
    text-align: left;
    margin: 1.5rem auto;
}

.notes {
    font-size: 1.5rem;
}

.center {
    text-align: center;
}

h1.capitalize,
h2.capitalize,
h3.capitalize,
h4.capitalize {
    text-transform: capitalize;
}

h1.lowercase,
h2.lowercase,
h3.lowercase,
h4.lowercase {
    text-transform: lowercase;
}

h1.sentence,
h2.sentence,
h3.sentence,
h4.sentence {
    text-transform: none;
}

ul li,
ol li,
p,
h2 {
    text-align: left;
    margin-top: 1.5rem;
    width: 90%;
}

ol li {
    margin-left: 1.5rem;
}

code {
    color: #ff357c;
    word-wrap: break-word;
}

[data-javascript] {
    color: pink;
}

strong {
    color: #ffd166;
}

/* slide 2 */
.change-color {
    background: red;
    width: 250px;
    height: 250px;
    margin: 0 auto;
}

.btn {
    margin: 1.5rem auto;
    text-align: center;
    display: flex;
    padding: 5px 10px;
}

/* styling fro toggleSrc hiddenCan/VisibleCan src attribute */
#imageBtn {
    padding: 10px;
    font-size: 2.25rem;
    background: #e50098;
    color: #fff;
    box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    outline: none;
    border: none;
    margin: 0 auto;
    display: block;
    text-align: center;
}

fieldset {
    display: flex;
    margin: 1.25rem 0;
}

input {
    padding: 8px;
}

[placeholder] {
    font-size: 1.2rem;
}

#submit,
#submit1 {
    padding: 5px 10px;
    font-size: 1.25rem;
}

/* styling for form example using Constraint Validation API */

.wrapper {
    display: block;
    margin: 40px auto;
    text-align: center;
}

h1 {
    text-align: center;
    color: #228b22;
}

form {
    margin: 40px auto;
    background: #ffc600;
    width: 75%;
    padding: 20px;
}

input {
    display: block;
    margin: 10px auto;
    /* width: 200px;
    height: 20px; */
    color: #228b22;
    -webkit-appearance: none;
    font-size: 0.9rem;
}

input[name='username']::-webkit-input-placeholder {
    /* Chrome/Opera/Safari */
    color: #228b22;
}

input[name='username']::-moz-placeholder {
    /* Firefox 19+ */
    color: #228b22;
}

input[name='username']:-ms-input-placeholder {
    /* IE 10+ */
    color: #228b22;
}

input[name='username']:-moz-placeholder {
    /* Firefox 18- */
    color: #228b22;
}

input[name='mail']::-webkit-input-placeholder {
    /* Chrome/Opera/Safari */
    color: #228b22;
}

input[name='mail']::-moz-placeholder {
    /* Firefox 19+ */
    color: #228b22;
}

input[name='mail']:-ms-input-placeholder {
    /* IE 10+ */
    color: #228b22;
}

input[name='mail']:-moz-placeholder {
    /* Firefox 18- */
    color: #228b22;
}

input[name='password']::-webkit-input-placeholder {
    /* Chrome/Opera/Safari */
    color: #228b22;
}

input[name='password']::-moz-placeholder {
    /* Firefox 19+ */
    color: #228b22;
}

input[name='password']:-ms-input-placeholder {
    /* IE 10+ */
    color: #228b22;
}

input[name='password']:-moz-placeholder {
    /* Firefox 18- */
    color: #228b22;
}

button,
#btnSubmit {
    margin: 20px auto;
    color: #228b22;
    background: #caff70;
    letter-spacing: 0.1em;
    border: 2px dashed #228b22;
    font-size: 1rem;
    border-radius: 3px;
    box-shadow: 0 2px 2px #333;
    cursor: pointer;
    outline: none;
    padding: 5px 10px;
}

img {
    width: 100%;
}

iframe {
    margin: 0 auto;
    display: block;
    text-align: center;
}