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


body {
    background-color: #fff;
    color: #333;
    font: 1.2em / 1.5 Helvetica Neue, Helvetica, Arial, sans-serif;
    padding: 0;
    margin: 0;
}


button {
    cursor: pointer;
}


section {
    padding: 50px 0;
    text-align: center;
}


ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}


/* components */


.task-title {
    font-size: 20px;
    font-style: italic;
    font-weight: 500;
    text-decoration: underline;
    margin-bottom: 100px;
}


.container {
    width: 1440px;
    margin: 0 auto;
    padding: 0px 40px;
}


.module-title {
    text-align: center;
}

.number-container {
    display: flex;
    flex-wrap: wrap;
}

.number {
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 18px;
    font-weight: 700;


    margin: 5px;
}

.even {
    background-color: #8bc34a;
}

.odd {
    background-color: #ffed3b;
}

/* form styles */
.contact-form {
    display: flex;
    flex-direction: column;
    width: 600px;
    margin: 0 auto;
    padding: 20px;
    box-shadow: 0px 5px 10px 2px rgba(34, 60, 80, 0.2);
}
.contact-form-input {
    height: 40px;
    border: 1px solid #cccccc;
    padding-left: 20px;
    margin-bottom: 20px;
}


.contact-form-btn {
    margin-top: 20px;
}


.success {
    outline: 3px solid greenyellow;
}


.error {
    outline: 3px solid red;
}


span {
    text-decoration: underline;
}

/* Box */
.box {
    width: 50px;
    height: 50px;
    border: 2px dashed red;
    margin: 10px;
}

.active {
    color: red;
}