styles.css

body {
    margin: 0
}

/* header CSS */
header {
    display: flex;
    justify-content: space-evenly;
    position: sticky;
    margin: auto;
    top: 0;
    box-shadow: 1px 2px 2px rgb(0 0 0 / 10%), -1px -1px 2px rgb(0 0 0 / 8%);
    align-items: center;
    line-height: 45px;
    text-decoration: none;
    font-size: 18px;
    background-color: burlywood;
}

/* main CSS */

.outer {
    position: relative;
    display: flex;
    align-items: center;
    justify-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
}

.main-content {position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, 50%);
    height: 220px;
    width: 30%;
    border: 1px solid wheat;
    background-color: #c5866f;
    border-radius: 8px;
    box-shadow: 0 1px 5px rgb(97 97 97);
    margin: auto;
    /*margin-top: 210px;*/
    display: flex;
    justify-content: center;
    align-items: center;
}

input[type=text] {
    box-shadow: 0 1px 5px rgb(97 97 97);
    background-color: #e1bb80;
    color: rgb(1, 54, 70);
    font-weight: bold;
    padding: 5px;
    border: 1px solid wheat;
    height: 50px;
    width: 220px;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    font-size: 26px;
    text-align: center;
}

/* footer CSS */
.footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 3.5rem;
    text-align: center;
    background-color: burlywood;
    font-size: 17px;
}