.page404-container{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-flow: column;
    width: 100%;
}
.page404-container h1{
    width: 183px;
    font-family: "Fira Sans Extra Condensed", sans-serif;
    font-size: 31px;
    text-align: center;
    margin: 0;
}
.page404-container span{
    width: 183px;
    font-family: "Fira Sans Extra Condensed", sans-serif;
    font-size: 118px;
    line-height: 117px;
    color: rgb(19, 125, 173);
    text-align: center;
}
.btn-back{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 150px;
    height: 50px;
    font-family: "Fira Sans Extra Condensed", sans-serif;
    font-size: 21px;
    cursor: pointer;
    color: rgb(255, 255, 255);
    margin-top: 20px;
    background: rgb(19, 125, 173);
    border: 2px solid rgba(255, 255, 255, 0);
    transition: all 0.5s;
}
.btn-back:hover{
    color: rgb(0, 0, 0);
    border: 2px solid rgb(19, 125, 173);
    background: transparent;
    transition: all 0.5s;
}