.container {
    margin-left: auto;
    margin-right: auto;
}

.container-vw-20  { width: 20vw;  }
.container-vw-30  { width: 30vw;  }
.container-vw-40  { width: 40vw;  }
.container-vw-50  { width: 50vw;  }
.container-vw-60  { width: 60vw;  }
.container-vw-80  { width: 80vw;  }
.container-vw-100 { width: 100vw; }

.container-400  { width: 400px;  }
.container-800  { width: 800px;  }
.container-1200 { width: 1200px; }

.splitter { 
    width: 100%;
    display: flex;
    margin: 0;
}

@media only screen and (min-width: 600px) {
    .d-visible-xs { display: none;  }
    .d-hidden-xs  { display: block; }
}

@media only screen and (max-width: 600px) {
    .d-visible-xs { display: block; }
    .d-hidden-xs  { display: none;  }
}

@media only screen and (min-width: 1000px) {
    .d-visible-sm { display: none;  }
    .d-hidden-sm  { display: block; }
}

@media only screen and (max-width: 1000px) {
    .d-visible-sm { display: block; }
    .d-hidden-sm  { display: none;  }
}

@media only screen and (min-width: 1400px) {
    .d-visible-md { display: none;  }
    .d-hidden-md  { display: block; }
}

@media only screen and (max-width: 1400px) {
    .d-visible-md { display: block; }
    .d-hidden-md  { display: none;  }
}

.ratio-1-7 {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
}

.ratio-1-7 iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
}

.split-5  { width: 10%; }
.split-10 { width: 10%; }
.split-25 { width: 25%; }
.split-30 { width: 30%; }
.split-33 { width: 33%; }
.split-40 { width: 40%; }
.split-50 { width: 50%; }
.split-60 { width: 60%; }
.split-66 { width: 66%; }
.split-75 { width: 75%; }
.split-80 { width: 80%; }
.split-90 { width: 90%; }
.split-95 { width: 95%; }

.flex { display: flex; }
.flex-centre { justify-content: center; }

.cover {
    position: relative;
    top: 0;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
}

.cover:after {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

.cover-img {
    height: 100%;
    width: 100vw;
    object-fit: cover;
    object-position: left;
    filter: brightness(50%);
    pointer-events: none;
}

.cover-item-centre {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.cover-items {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}