#intro_div {
    padding-top: 6vh;
    width: 70vw;
    margin-left: auto;
    margin-right: auto;
}

#logo_holder {
    position: absolute;
    color: white;
    top: 20%;
    right: 24%;
    text-align: center;
}

#logo_holder div {
    font-size: 3.7vw;
    font-family: 'Bebas Neue', cursive;
}

#intro_pic {
    width: 100%;
    height: 67vh;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

#first_section {
    padding-bottom: 5vh;
    background-color: var(--grey);
}

#first_section h1 {
    color: var(--blue2);
    margin-top: 3vh;
    text-align: center;
    font-size: 2.2vw;
}

#third_section h1 {
    margin-top: 3vh;
    text-align: center;
    font-size: 2.2vw;
}

h2 {
    font-size: 1.8vw;
}

#intro_quote {
    width: 55vw;
    margin-left: auto;
    margin-right: auto;
    display: block;
    text-align: center;
    font-size: 1.4vw;
}

#training_h1 {
    margin-top: 6vh;
    text-align: center;
    font-size: 2.8vw;
    color: var(--orange1);
}

table {
    width: 75%;
    margin: 0 auto -2px auto;
    background-color: var(--grey);
}

table td {
    text-align: center;
}

table img {
    width: 100%;
    vertical-align: bottom;
}

table .img_holder {
    width: 60%;
    overflow: hidden;
}

table .text_holder {
    width: 40%;
}

.text_holder div {
    width: 80%;
    margin: 0 auto;
}

.text_holder a {
    padding: 2vh 3vw;
    color: white;
    background-color: var(--orange1);
}

.text_holder a:hover {
    background-color: var(--orange2);
}

.img_holder img {
    transition: 0.7s ease;
}

.img_holder img:hover {
    transform: scale(1.3);
}

.detail_btn {
    margin-top: 60px !important;
}

#third_section {
    margin-top: 7vh;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

#third_section h1 {
    color: white;
    background-color: var(--blue2);
    padding: 2vh 0;
    width: 80%;
    margin: 0 auto;
    border-top-right-radius: 25px;
    border-top-left-radius: 25px;
}
  
.row {
    display: -ms-flexbox; /* IE10 */
    display: flex;
    -ms-flex-wrap: wrap; /* IE10 */
    flex-wrap: wrap;
    padding: 0;
    margin: 0 auto;
    width: 80%;
}
  
.column {
    -ms-flex: 33.33%; /* IE10 */
    flex: 33.33%;
    max-width: 33.33%;
    padding: 0;
}
    
.container {
    position: relative;
    width: 100%;
}
  
.image {
    width: 100%;
    height: auto;
    vertical-align: middle;
    width: 100%;
}
  
.overlay {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    width: 100%;
    opacity: 0;
    transition: .3s ease;
    background-color: rgba(255, 255, 255, 0.9);
}
  
.container:hover .overlay {
    opacity: 1;
    box-shadow: 0px 5px 10px 0px rgba(0,0,0,0.7);
    z-index: 1;
}
  
.quotes {
    color: black;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    text-align: center;
    width: 80%;
}

.quotes p {
    color: var(--blue2);
}

#hover_to_learn {
    width: 80%;
    padding: 7vh 0;
    margin: 0 0 0 10%;
    color: white;
}

#split_3-4 {
    border: none;
    margin: 0 auto 5vh auto;
    padding: 1px;
    width: 35vw;
    background-color: var(--blue2);
}

.last_col1 {
    border-bottom-left-radius: 25px;
}

.last_col2 {
    border-bottom-right-radius: 25px;
    border-bottom-left-radius: 25px;
}

.last_col3 {
    border-bottom-right-radius: 25px;
}

#water_explanation {
    background-color: var(grey);
    margin-top: 5vh;
    padding-top: 7vh;
    box-shadow: inset 0 0 10px #b1b1b1;
}

#water_explanation #words {
    width: 100%;
    text-align: center;
}

#water_explanation #words div {
    width: 70%;
    margin: 0 auto;
}

#water_explanation h1 {
    color: var(--blue2);
}

#water_explanation p {
    font-size: 1.5vw;
}

@media screen and (max-width: 1300px) {
    #logo_holder div {
        line-height: 70px;
        margin-bottom: 20px;
    }

    #first_section h1 {
        font-size: 30px;
        margin-left: auto;
        margin-right: auto;
        width: 90%;
    }

    #second_section h1 {
        font-size: 30px;
        margin-left: auto;
        margin-right: auto;
        width: 90%;
    }

    table {
        width: 80%;
    }

    .training_section {
        height: 370px;
    }

    .training_section h2 {
        font-size: 25px;
    }

    .training_explanation {
        font-size: 20px;
    }
    
    .training_explanation a {
        font-size: 20px;
    }
}

@media screen and (max-width: 1100px) {
    #intro_div {
        padding-top: 0;
        width: 80vw;
        margin-left: auto;
        margin-right: auto;
    }
    
    .training_section {
        height: 330px;
    }

    .training_section h2 {
        font-size: 25px;
    }

    .training_explanation {
        font-size: 20px;
    }
    
    .training_explanation a {
        font-size: 20px;
    }

    #logo_holder {
        top: 100px;
        right: 230px;
    }
    
    #logo_holder div {
        font-size: 50px;
    }
    
    #intro_pic {
        height: 500px;
    }
    
    #intro_quote {
        font-size: 20px;
    }

    #water_explanation #words div {
        width: 90%;
    }

    #water_explanation p {
        font-size: 24px;
    }
}

@media screen and (max-width: 1000px) {
    #logo_holder {
        top: 100px;
        right: 210px;
    }
}

@media screen and (max-width: 900px) {
    #intro_div {
        width: 100%;
    }
    
    #logo_holder {
        top: 100px;
        right: 150px;
    }
    
    #intro_quote {
        width: 85%;
    }
    
    table {
        width: 100%;
    }

    .detail_btn {
        margin-top: 40px !important;
    }
    
    #third_section h1 {
        font-size: 3vw;
    }
    
    #col2 {
        display: none;
    }

    .column {
        -ms-flex: 50%; /* IE10 */
        flex: 50%;
        max-width: 50%;
    }

    .last_col3 {
        border-bottom-right-radius: 25px;
        border-bottom-left-radius: 25px;
    }

    .quotes {
        font-size: 1.45vw !important;
    }
    
    #water_explanation p {
        font-size: 25px;
    }
}

@media screen and (max-width: 700px) {
    #logo_holder {
        top: 100px;
        right: 100px;
    }
    
    .training_section {
        height: 250px;
    }

    .training_explanation h2 {
        font-size: 20px;
    }

    .training_explanation {
        font-size: 15px;
    }
    
    .training_explanation a {
        font-size: 15px;
    }

    .detail_btn {
        margin-top: 30px !important;
    }
    
    #third_section h1 {
        font-size: 5vw;
    }

    #water_explanation p {
        font-size: 23px;
    }
}

@media screen and (max-width: 600px) {
    #logo_holder div {
        line-height: 60px;
        margin-bottom: 10px;
    }
    
    #logo_holder {
        top: 80px;
        right: 70px;
    }
    
    #logo_holder div {
        font-size: 40px;
    }
    
    #intro_pic {
        height: 400px;
    }
    
    .training_section {
        height: 230px;
    }

    .training_explanation h2 {
        font-size: 17px;
    }

    .training_explanation {
        font-size: 12px;
    }
    
    .training_explanation a {
        font-size: 12px;
    }

    .text_holder div {
        width: 90%;
    }
    
    .detail_btn {
        margin-top: 20px !important;
    }

    #third_section h1 {
        font-size: 4vw;
    }

    #col1 {
        display: none;
    }

    .column {
        -ms-flex: 100%; /* IE10 */
        flex: 100%;
        max-width: 100%;
    }

    .last_col1 {
        border-bottom-right-radius: 25px;
        border-bottom-left-radius: 25px;
    }

    .quotes {
        font-size: 2.7vw !important;
    }

    #water_explanation p {
        font-size: 18px;
    }
}

@media screen and (max-width: 465px) {
    #logo_holder {
        top: 90px;
        right: 20px;
    }

    #logo_holder div:first-child {
        font-size: 50px !important;
    }
    
    #intro_pic {
        height: 350px;
    }
    
    .training_section {
        height: 165px;
    }

    .training_explanation h2 {
        font-size: 13px;
    }

    .training_explanation {
        font-size: 10px;
    }
    
    .training_explanation a {
        font-size: 10px;
        padding: 9px 15px;
    }

    .text_holder div {
        width: 95%;
    }

    .detail_btn {
        margin-top: 10px !important;
    }

    #water_explanation p {
        font-size: 15px;
    }
}