* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
    font-size: x-large;
}

.caja1 {
    background-color: #8398bb;
    height: 100px;
    border: 2px solid blue;
    display: flex;
    justify-content: center;
    align-items: center;
}

.caja2 {
    background-color: rgb(255, 255, 255);
    height: 300px;
    display: flex;
    border: 2px solid blue;
    justify-content: center;
}

.caja3 {
    background-color: #ffffff;
    height: 300px;
    border: 2px solid blue;
    display: flex;
    justify-content: center;
}

.caja4 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja5 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja6 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja7 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja8 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja9 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja10 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja11 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja12 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja13 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja14 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}

.caja15 {
    background-color: #ffffff;
    border: 2px solid #3700ff;
    height: 300px;
    display: flex;
    justify-content: center;
}