index.css

* {
    box-sizing: border-box;
}

body {
    direction: rtl;
    margin: 0;
    padding: 0;
    background-repeat: no-repeat;
    height: 728px;
}

header {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    background-color: rgba(221, 249, 240, 0.779);
    height: 90px;
    box-shadow: rgba(17, 17, 26, 0.1) 0px 4px 16px, rgba(17, 17, 26, 0.1) 0px 8px 24px, rgba(17, 17, 26, 0.1) 0px 16px 56px;
}

header h1,
header h2 {
    color: rgba(12, 41, 54, 0.849);
}

nav {
    width: 100%;
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 50px;
}

nav button {
    background-color: purple;
    padding: 15px;
    width: 200px;
    margin: 0 15px;
    font-size: 16px;
    color: black;
    cursor: pointer;
    border-radius: 7px;
    color: white;
}

nav button:hover {
    transition: 0.1s all ease-in-out;
    background-color: rgb(19, 19, 33);
    scale: 1.05;
}

.four {
    height: 638px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: -65px;
    visibility: visible;
}

.four .four1 {
    height: 550px;
    width: 100%;
    position: relative;
}

.four .four1 .line {
    margin-top: 200px;
    height: 30px;
    width: 95%;
    border-radius: 125px;
    display: flex;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid rgba(174, 199, 91, 0.509);
    background-color: #e1e1e1;
    box-shadow: rgba(0, 0, 0, 0.16) 0px 3px 6px, rgba(0, 0, 0, 0.23) 0px 3px 6px;
    opacity: 0.8;
}

.four .four1 .box {
    z-index: 2;
    position: absolute;
    height: 200px;
    width: 75%;
    right: 190px;
    top: 120px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.four .four1 .box .sec {
    height: 100px;
    width: 20%;
    background-color: white;
    border-radius: 10px;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    box-shadow: rgba(0, 0, 0, 0.1) 0px 20px 25px -5px, rgba(0, 0, 0, 0.04) 0px 10px 10px -5px;
    border: 2px solid #e1e1e1;
}

.four select {
    padding: 10px;
    outline: blue;
    font-size: 16px;
    text-align: center;

}

.four select option {
    font-size: 13px;
    color: white;
    font-size: 0.91em;
    font-size-adjust: 0.1;
}

.four button {
    background-color: blue;
    padding: 17.5px;
    width: 200px;
    font-size: 16px;
    color: black;
    cursor: pointer;
    border-radius: 15px;
    color: white;
}

.four button:hover {

    transition: 0.1s all ease-in-out;
    background-color: rgb(19, 19, 33);
}

.four #cal {
    margin-top: 140px;
    display: flex;
    margin-left: auto;
    margin-right: auto;
    width: 250px;
    text-align: center;
    justify-content: center;
}

.five {
    height: 638px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: -637px;
    visibility: hidden;
}

.five .four1 {
    height: 550px;
    width: 100%;
    position: relative;
}

.five .four1 .line {
    margin-top: 200px;
    height: 30px;
    width: 95%;
    border-radius: 125px;
    display: flex;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid rgba(174, 199, 91, 0.509);
    background-color: #e1e1e1;
    box-shadow: rgba(0, 0, 0, 0.16) 0px 3px 6px, rgba(0, 0, 0, 0.23) 0px 3px 6px;
    opacity: 0.8;
}

.five .four1 .box {
    z-index: 2;
    position: absolute;
    height: 200px;
    width: 85%;
    right: 115px;
    top: 120px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.five .four1 .box .sec {
    height: 100px;
    width: 25%;
    background-color: white;
    border-radius: 10px;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    box-shadow: rgba(0, 0, 0, 0.1) 0px 20px 25px -5px, rgba(0, 0, 0, 0.04) 0px 10px 10px -5px;
    border: 2px solid #e1e1e1;
    margin: 0 15px;
}

.five select {
    padding: 10px;
    outline: blue;
    font-size: 16px;
    text-align: center;

}

.five select option {
    font-size: 13px;
    color: white;
    font-size: 0.91em;
    font-size-adjust: 0.1;
}

.five button {
    background-color: blue;
    padding: 17.5px;
    width: 75px;
    font-size: 16px;
    color: black;
    cursor: pointer;
    border-radius: 15px;
    color: white;
}

.five button:hover {

    transition: 0.1s all ease-in-out;
    background-color: rgb(19, 19, 33);
}

.five #cal5 {
    margin-top: 140px;
    display: flex;
    margin-left: auto;
    margin-right: auto;
    width: 250px;
    text-align: center;
    justify-content: center;
}