header {
    color: rgb(209, 234, 255);
    max-width: 1300px;
    height: 1500px;
    background: -webkit-linear-gradient(135deg, rgb(0, 0, 0), rgb(247, 0, 0) 100%);
    background: -moz-linear-gradient(135deg, rgb(0, 0, 0), rgb(247, 0, 0) 100%);
    background: linear-gradient(135deg, rgb(0, 0, 0), rgb(247, 0, 0) 100%);
    margin: 0 auto;
    border-left: 5px solid rebeccapurple;
    border-radius: 50px 0 0 50px
}

.header__top {
    display: inline-block;
    border-radius: 10%;
    padding: 15px;
    margin: 15px;
    border: 3px solid #00fffb86;
    width: 300px;
    height: 300px;
    background-color: rgb(115, 114, 113);
}