@media (max-width: 780px) {

    #mainFormTitle {
        margin-left: 6vh;
    }

    #headerLinkBox {
        margin-left: 15vw;
        width: 100vw;
        margin-bottom: 2vh;
    }

    #rightTopHeaderBox {
        margin-left: 6vw;
    }

    tr {
        display: block;
        width: 100vh;
    }

    #searchBox {
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 90vw;
        max-width: 500px;
    }

    #searchTextboxBox,
    #searchButtonBox {
        width: 100%;
    }

    #searchTextBox {
        width: 100vh;
        padding: 0.5em;
        font-size: 1em;
        box-sizing: border-box;
    }
}