*{ box-sizing: border-box;}

body {
    margin:0;
}
.header {
    background: black;
    width: 100vw;
    height: 15vh;
    display: flex;
    flex-direction: row;
}

.header-top-item {
    color: white;
    font-size: 100px;
    margin-left: 140%;

}

.main-container {
    background: white;
    width: 100vw;
    height: 85vh;
    display: flex;
    flex-direction: row;
    padding: 0px;
    /* align-items: center; */
}
/* .upper {
    width: 90%;
    height:58%;
    display: flex;
} */

.upper-item {
    background: black;
    width: 80%;
    height: 54%;
    display: block;
    position: absolute;
    top: 0;
    left: 60%;
}

.lower {
    width: 100%;
    height: 88%;
    display: flex;
}
.lower-item {
    border: 2px solid black;
    width: 100%;
    height: 88%;
    
    position: relative;
    display: block;
}