body, h2 {
    text-align: center;
}
.tab-wrapper {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
}
.tab-wrapper .tab-item {
    flex: 0;
    flex-basis: 160px;
    height: 40px;
    line-height: 40px;
    background: #0170fe;
    border-radius: 30px;
    color: #fff;
    font-size: 16px;
    text-shadow: 0 -1px 0 rgb(0 0 0 / 12%);
    box-shadow: 0 2px 0 rgb(0 0 0 / 5%);
    cursor: pointer;
}
article {
    max-width: 800px;
    margin: auto;
    text-align: left;
}
p {
    line-height: 2;
}
.center {
    text-align: center;
}
.bold {
    font-weight: bold;
}
.red {
    color: red;
}
.blue {
    color: rgb(0, 112, 192);
}
.green {
    color: rgb(17, 159, 17);
}
.purple {
    color: rgb(153, 51, 229);
}
.big {
    font-size: 24px;
}