.park {
    background-repeat:no-repeat;
    background-size:contain;
    height: 200px;
    margin-bottom: 25px;
}

.park-container {
    flex-wrap: wrap;
}

.acadia {
    background-image: url(/park/acadia.jpg);
}
.arches {
    background-image: url(/park/arches.jpg);
 }
.arctic {
    background-image: url(/park/arctic.jpg);
}
.badlands {
    background-image: url(/park/badlands.jpg);
}  
.big-bend {
    background-image: url(/park/bigbend.jpg);
}
.biscayne {
    background-image: url(/park/biscayne.jpg);
}  
.bryce {
    background-image: url(/park/bryce.jpg);
}
.canyonlands {
    background-image: url(/park/canyonlands.jpg);
}  
.capitol-reef {
    background-image: url(/park/capitol-reef.jpg);
}
.carlsbad-caverns {
    background-image: url(/park/carlsbad-caverns.jpg);
}  
.cascades {
    background-image: url(/park/cascades.jpg);
}
.channel-islands {
    background-image: url(/park/channel-islands.jpg);
}
.congaree {
    background-image: url(/park/congaree.jpg);
}  
.crater-lake {
    background-image: url(/park/crater-lake.jpg);
}
.cuyahoga {
    background-image: url(/park/cuyahoga.jpg);
}
.death-valley {
    background-image: url(/park/death-valley.jpg);
}  
.denali {
    background-image: url(/park/denali.jpg);
}  
.dry-tortugas {
    background-image: url(/park/dry-tortugas.jpg);
}
.everglades {
    background-image: url(/park/everglades.jpg);
}  
.glacier-bay {
    background-image: url(/park/glacier-bay.jpg);
}  
.gateway-arch {
    background-image: url(/park/gateway-arch.jpg);
}
.glacier {
    background-image: url(/park/glacier.jpg);
}  
.grand-canyon {
    background-image: url(/park/grand-canyon.jpg);
}
.grand-teton {
    background-image: url(/park/grand-teton.jpg);
}  
.great-basin {
    background-image: url(/park/great-basin.jpg);
}
.guadalupe {
    background-image: url(/park/guadalupe.jpg);
}
.haleakala {
    background-image: url(/park/haleakala.jpg);
}
.hot-springs {
    background-image: url(/park/hot-springs.jpg);
}
.indiana-dunes {
    background-image: url(/park/indiana-dunes.jpg);
}  
.isle-royale {
    background-image: url(/park/isle-royale.jpg);
}
.joshua-tree {
    background-image: url(/park/joshua-tree.jpg);
}  
.katmai {
    background-image: url(/park/katmai.jpg);
}
.kenai {
    background-image: url(/park/kenai.jpg);
}  
.kings-canyon {
    background-image: url(/park/kings-canyon.jpg);
}
.kobuk {
    background-image: url(/park/kobuk.jpg);
}  
.lake-clark {
    background-image: url(/park/lake-clark.jpg);
}
.lassen-volcanic {
    background-image: url(/park/lassen-volcanic.jpg);
}  
.mammoth-cave {
    background-image: url(/park/mammoth-cave.jpg);
}
.mesa-verde {
    background-image: url(/park/mesa-verde.jpg);
}  
.olympic {
    background-image: url(/park/olympic.jpg);
}  
.petrified-forest {
    background-image: url(/park/petrified-forest.jpg);
}
.pinnacles {
    background-image: url(/park/pinnacles.jpg);
}  
.rainier {
    background-image: url(/park/rainier.jpg);
}
.redwood {
    background-image: url(/park/redwood.jpg);
}
.rocky-mountain {
    background-image: url(/park/rocky-mountain.jpg);
}  
.roosevelt {
    background-image: url(/park/roosevelt.jpg);
}
.samoa {
    background-image: url(/park/samoa.jpg);
}  
.saguaro {
    background-image: url(/park/saguaro.jpg);
}
.sand-dunes {
    background-image: url(/park/sand-dunes.jpg);
}  
.sequoia {
    background-image: url(/park/sequoia.jpg);
}
.shenadoah {
    background-image: url(/park/shenandoah.jpg);
}
.smoky-mountains {
    background-image: url(/park/smoky-mountains.jpg);
}  
.virgin {
    background-image: url(/park/virgin.jpg);
}
.volcanoes {
    background-image: url(/park/volcanoes.jpg);
}  
.wind-cave {
    background-image: url(/park/wind-cave.jpg);
}
.wrangell {
    background-image: url(/park/wrangell.jpg);
}
.yellowstone {
    background-image: url(/park/yellowstone.jpg);
}
.yosemite {
    background-image: url(/park/yosemite.jpg);
}
.zion {
    background-image: url(/park/zion.jpg);
}